Wire Inductance Calculator

The next step is to calculate the thickness of wire required. If an input is given then it can easily show the result for the given number. The Inductance Calculator an online tool which shows Inductance for the given input. The inductance of a wire loop is a common example of a circuit with inductance. The best of electronic design! EEWeb is the home for experienced and novice designers alike to share tips and to ask and answer questions. 4582 l c -0. The amount of reactance the inductance creates is directly proportional to frequency. solid plane minimizes inductance to the absolute minimum which is a desirable trait for high speed signals – which includes both Analog and Digital signals. Traces on PCBs are small and therefore have small inductance levels. This is the origin of the rule of thumb that the total inductance of a wire is about 25 nH/inch. Larger wire lowers the dc resistance but at the expense of bigger parts and possibly a lower self-resonant frequency. Observe changes to the equation and wire as you play with the resistivity, length, and area sliders. Coil-Shortened Vertical Antenna Calculator. If there are n equal inductors L connected in parallel, then the equivalent inductance is. Find Inductor Calculators at CalcTown. Not very good but considering the wire used this is to be expected. Get on-line support on this project! New. This online electrical calculator allows you to calculate the toroid inductance value per turn. The inductance was measured at 55. Calculate the inductance of a coil as an educational exercise or if you expect someday to build a radio from spare parts. For a set of N conductors, power_lineparam computes three N-by-N matrices: the series resistance and inductance matrices [R] and [L] and the shunt capacitance matrix [C]. We're in High voltage lab thus inductance of ground wire seems really important to stabilize the system since I. They usually require you to specify your choice of wire gauge (diameter), turn pitch, coil diameter and overall length. This allows low frequency signals to pass with minimal attenuation. Here, we explore using simulation to compute the mutual inductance in different wire coil arrangements. Introduction to metal detection Most metal detectors work on the fact that metals in a magnetic field change the behaviour of the field. ! Assume we have a transmission line in which air separated the two perfect conductors. 30-1 Faraday’s Law and Lenz’s Law. Capacitor value(s) are given in millionths of a Farad (µF). I'm now trying to calculate the inductance of a single wire as a ground wire. Pi and Tee Attenuator Pad; Y and Delta Network Transformation; 1:N Resistive Splitter; Return Loss and VSWR; Matching. Inductance values are calculated to 3 decimal places and are given in nH, µH, mH and even to 5 decimal places, H! An example of a T-match inductor for 1. The Coil32 program is coil inductance calculator, that computes: one-layer and multi-layer air core inductors, coils on ferrite rings, on the pot core, flat coils on PCB, and also calculates RLC resonance circuit parameters. Electric Wire Resistance for Various Materials. Put the values in the formula 1:. Absolute precision is not critical here, so you can use this setup to measure inductance. Magnet wire is typically sold by weight, so it's important to know the required wire weight. * Will calculate the Inductance of a loose wound form. Let’s determine the inductance of this structure! First, we recall that inductance is the ratio of the current and. Simply enter in you wire and wick details then the resistance you'd like to achieve and the calculator will do the rest - telling you how many wraps to make. Free Online Engineering Calculator (Javascript) to calculate the number of winding turns required to achieve a desired inductance with ferrite and iron powder toroidal cores. Inductance. 0, 01/2014 4 Freescale Semiconductor, Inc. Base Inductance is the Lorenz Current Sheet value which contains no corrections, or the Maxwell formula value, depending on the number of turns. ) Well, that equation is an approximation. Nitin Raulji - August 23, 2006 Hi ! Very interesting site for the entire electronics design/ manufacturing industry. That is a good idea. See wikipedia:American wire gauge. In this tool, the variables required are length and wire diameter. This online calculator tells you how the amout of inductance your loading coil will need to have. in many rf circiuts i've seen inductors specified by 20 turns 18swg. Note that self-inductance of a wire is often not measured since it is only a part of a circuit's loop. The coils you buy will have the henrys (measure of inductance) clearly marked. The calculator uses Bob Weaver's equation with round wire. μ r: relative permeability of the medium. Toroid Coil Winding Calculator Use this online tool to calculate the number of winding turns required to achieve the desired inductance with ferrite and iron powder toroidal cores. Thinner wire stretches more easily, but it also bends more easily, requiring less tension on a small mandrel. calculate the inductance of twin lead. prioritywire. Each one represents a continuous transition between the extremes of a long coil and a short coil. Coilcraft Design Tools Calculate and find the best inductor for your switcher topology. 5 cm and length of 1 cm. The length of wire needed to make the coil does not include the lead length you may need so if you need 6 inches from each end of the coil add a foot to the length. Mutual Inductance - Example 2. For example, a 200um wire will have 200 pH inductance. So we need around 205 turn of wire to get an inductor of 80 mH from a core with an AL value of 1900 nH. effectiveinproducingself-inductance,andhencetheself-inductance is always greater than the mutual inductance of that circuit with any other, assumingone turn ineach. solid plane minimizes inductance to the absolute minimum which is a desirable trait for high speed signals – which includes both Analog and Digital signals. The conventional (Kettering) spark ignition system in automotive applications uses a coil which performs the dual functions of energy storage and voltage step up. Graphs relating inductance with number of turns and diameter of copper wire, length and diameter of core are used to develop the equation of inductance which is: L= 3. Find Inductor Calculators at CalcTown. The simple formula for. 23 ELECTROMAGNETIC INDUCTION, AC CIRCUITS, AND ELECTRICAL TECHNOLOGIES Figure 23. Apply Faraday’s law, which is the relationship between an induced emf in a conducting loop and the rate at which magnetic flux through the loop changes. It uses coils (inductors) and capacitors to cause a rolloff of the audio level above or below certain frequencies to prevent unwanted portions of the audio from reaching the various speakers. calculate the inductance of twin lead. Introduction Electrical energy is rarely supplied in the form it is needed. h: height of the rectangle. Depending on the application, resistor inductance might be easily disregarded, especially in DC circuits. Wire conductivities are 100 percent IACS copper and 61 percent AICS aluminum, and aluminum conduit is 45 percent. The self inductance of a straight wire at high frequency is: Where d is the diameter in cm. Traces on PCBs are small and therefore have small inductance levels. It assumes that the wire is perfectly straight … Cylindrical Capacitor - Georgia State University. This formula applies at 'low' frequencies (<3MHz) using enameled copper wire tightly wound. Resistivity of a material is the resistance from face to opposite face of a 1m cube of a material. That is a good idea. Ferrite is a class of ceramic material with strong electromagnetic properties such as high permeability in combination with low electrical conductivity. This is the origin of the rule of thumb that the total inductance of a wire is about 25 nH/inch. 4 Mutual Inductance of a Coil Wrapped Around a Solenoid A long solenoid with length l and a cross-sectional area A consists of N1 turns of wire. Depending on the application, resistor inductance might be easily disregarded, especially in DC circuits. Use the calculator below to obtain the inductance required for a desired line reactor impedance. Low AC Resistance Foil Inductor West Coast Magnetics I. Wheeler approximations for air core flat spiral coil inductor. For sure the resistance is easy to calculate, but the ampacity is the tricky one. For single layer coils, you may also use the following simpler calculators: Solenoid Inductance Calculator Rectangular Coil Calculator. Calculate voltage drop in an AC or DC circuit, find the minimum wire gauge required when planning a circuit, or determine the maximum length of conductors in a circuit. For more details on NPTEL visit http://nptel. If current I passes through a circular loop of radius R,then what will be the self inductance of that loop? (calculating flux through the loop leads to calculating magnetic field at every point inside the loop which is an elliptic integral. 5Vd)5VCorrect answer is option 'A'. A Clemson ECE635 Project by Adam Schreiber and Jason Byers. In addition it calculates an optimal compensating capacitor for series connection at the operating frequency. When connected to a voltage source with waveform V=120cos120t, the maximum current drawn is 4. Base Inductance is the Lorenz Current Sheet value which contains no corrections, or the Maxwell formula value, depending on the number of turns. Wire wound resistors are suitable as potentiometer, because of the durable construction. Simply enter the inductance into the boxes below and click the CALCULATE button. An online calculator to compute capacitive reactance. That wire may be coiled-up in a tiny volume, but its electrical length at radio frequencies cannot be ignored. Sinha, Department of Electrical Engineering,IIT Kharagpur. (a) Calculate the skin depth δ (μm) of the current density at the above frequencies. Put the values in the formula 1:. 99 - Biconical Antenna. Current capacity to BS 7671, ERA 69-30 and IEC 60502. This calculator provides a good estimate based on industry standard calculation methods and cable manufacturing data. This is seldom very significant, but that depends on how small the inner diameter of your coil is, and how much tension you put on the wire while you wrap it. For 25um diameter gold wire, the inductance will be approximately 1 pH for every micron of length. Here is a list of Best Free Inductance Calculator For Windows. It assumes that the wire is perfectly straight and that current is evenly distributed throughout the copper metal, which is approximately true for audio frequencies. Ferrite is a class of ceramic material with strong electromagnetic properties such as high permeability in combination with low electrical conductivity. Inductance calculated using this tool is the internal inductance of a straight, circular wire. The derivation. AC Power Calculator Single, Three & Two Phase Four Wire AC Power Calculator getcalc. • FY10 received: $348K Timeline Budget Barriers • The University of Tennessee • MaxQ Technology, LLC (module fabrication) Partners. Parallel Wire Inductance Calculator. An inductor is used to store energy in the form of a magnetic field. Resistance describes how strongly a given cable opposes the flow of an electric current, and conductance measures a wire's ability to conduct it. " To determine the size of conduit you need in order to fit your chosen cable, enter your Belden cable part number or the diameter of your cable. A three-phase line is said to be unsymmetrical when its conductors are situated at different distances. How to Calculate the Inductance of an Electric Cable Custom Search The inductance, L , per core of a 3-core cable or of three single-core cables comprises two parts namely the self-inductance of the conductor and the mutual inductance with other cores. It assumes that the two wires are identical, perfectly straight, and parallel to each other. 040 A uniform 1. Nonetheless, the reported inductance will in most circumstances result more accurate and certainly less ambiguous than the theoretical extremes (or average thereof) given by other inductance calculators. BogatinEnterprises. The imaginary part of the impedance (reactance) for the wire is calculated from the sum of the internal inductance and the external inductance. 5 Analytical F orm ulae for Coplanar W a. WHY? The thickest wire produces the best result. Graphs relating inductance with number of turns and diameter of copper wire, length and diameter of core are used to develop the equation of inductance which is: L= 3. ? A solenoid has 119 turns of wire uniformly wrapped around an air-filled core, which has a diameter of 11 mm and a length of 9. The self inductance of a coil is due to the magnetic flux around it and depends on its characteristics and construction, from size, number of turns and. As frequency increases, internal inductance decreases due to skin effect. (b) If the current through the solenoid decreases uniformly from 10 to 0 A in 0. Moving between the boxes by clicking or using the 'TAB' button on your keyboard, will update the result. Note that these formulas now accept "floating point" variables (an inductance value of 0. This tool is designed to calculate the inductance of a length of wire given its diameter and length. Mini Ring Core Calculator Program. For single layer coils, you may also use the following simpler calculators: Solenoid Inductance Calculator Rectangular Coil Calculator. In this paper, we offer a proposal for a new simplified method of calculating busbar inductance, the calculated results for some simple models, and applications to the analysis of stray resonance phenomena. NI Capacitance and Inductance Measurement Method. Here are a few calculators for electronic/radio circuits. Wireless Converters and Calculators. 4 Rise and decay of current goes through an inductor in the dc circuit. 024 mm in diameter) Design Frequency = 3. Electrical winding wire is used to create inductors. The conventional (Kettering) spark ignition system in automotive applications uses a coil which performs the dual functions of energy storage and voltage step up. (b) If the current through the solenoid decreases uniformly from 10 to 0 A in 0. known, it is easy to calculate the inductance L using equation (7). The inductance of conductors b and c will also be the same as that of a. Following is the formula for calculating the resistance of PCB trace. where L is the inductance (in Henrys), C the capacitance (in Farads) and w (should be a lowercase Omega) is the frequency in radians per second (or 2*pi*frequency in Hz). The Inductor. Then, under # of Cables, enter your details and hit "Calculate. It appears that you are using AdBlocking software. The Program does the following: * Will calculate the Inductance of a close wound form. An online calculator to compute capacitive reactance. Wire wound resistors are often used in circuit breakers or as fuses. Keep units constant. From the table, the resistivity of Aluminium is 0. Assume the impedance of the line is 50 ohm, phase constant is 20 (rad/m) and the operating frequency is 700MHz. The conductors are transposed and have a diameter of 2. 4 Rise and decay of current goes through an inductor in the dc circuit. As a preliminary, the derivation of a formula for calculating the inductance of a fine wire element, which is the basic component of a. Mini Ring Core Calculator Program. Self-inductance, the effect of Faraday’s law of induction of a device on itself, also exists. In particular, if the circuits are far apart, the magnetic flux through circuit 2 due to the current i 1 will be small and the mutual inductance will be small. Use this calculator to find the inductance of a multi-layer coil. 60] has worked out a variety of cases for polygons with side length s and wire. Air gaps between the windings decrease the distributed capacitances. Inductance of a circular loop in free space Consider Figure 4. Inductor and Inductance Calculation What is Inductor? An inductor is also named as a reactor, coil and choke. 2) Numerous Manufacturers make wire in 1/2 gauges. You cannot receive a refund if you have placed a ShippingPass-eligible order. First of all: If you just want a calculator that is simple to use, and you don't make mixed wires, the old coil wrapping calculator is probably a better choice for you. In the figure below, a long straight wire with current i passes (without touching) three rectangular wire loops with edge lengths L, 1. Determine the mutual inductance of the system. Moving between the boxes by clicking or using the 'TAB' button on your keyboard, will update the result. This page covers mutual inductance calculator. Coil Inductance. The best of electronic design! EEWeb is the home for experienced and novice designers alike to share tips and to ask and answer questions. INDUCTANCE OF THREE-PHASE TRANSMISSION LINES Determine the inductance per phase for a three-phase transmission line consisting of single conductors arranged unsymmetrically (Fig. The inductance and, as a result, the inductive reactance of a cable is a function of its geometry and physical relationship to other cables. Command-line program that helps you calculate coil dimensions based on various coil geometry options, such as straight round wire, N-turn circular loop, circular. if i use this mosfet with CD4047 inverter circuit. Frequency can be entered to find the Q of the inductor at a specific frequency, but is not required. br Abstract—The classical book by James Clerk Maxwell, “A Treatise on Electricity and Magnetism” (1873) [1], described an interesting method for the calculation of inductances, de-rived from a method that calculates mutual inductances. Inductance values are calculated to 3 decimal places and are given in nH, µH, mH and even to 5 decimal places, H! An example of a T-match inductor for 1. This page will explain how to calculate coils and will explain how you can make your own coils. 5Vd)5VCorrect answer is option 'A'. To find out more, check our Solenoid Inductance Calculator and RLC Circuit calculator. The calculator below computes this reactance for various gauges of hookup wire. For single layer coils, you may also use the following simpler calculators: Solenoid Inductance Calculator Rectangular Coil Calculator. Once all the winding turns are determined, the wire size should be properly chosen to minimize the winding conduction loss and leakage inductance. About Us Shipping Return and Refund Policy. Are there exceptions to this rule when applied to multi stranded wire (not litz wire). Round Wire dc Resistance Gives the dc resistance of a round straight wire using common conducting materials. Find Inductor Calculators at CalcTown. L = (20 Wb)(550)/5A. This tool is designed to calculate the inductance of a square loop of wire given its dimensions (width, height and diameter of the wire used). The RLCcircuit and the determination of inductance Se-yuen Mak The damped mobion of charges Is Investigated using a modified RLCclrcult. inductance (loop) The circuit analysis result: Z 0 = L L C L υ = 1 L LC L TD = L totalC C L C L C L C L C L C L Eric Bogatin 2000 Slide -4 www. To use this tool, just. 2) Numerous Manufacturers make wire in 1/2 gauges. VL is in volts, di/dt is the current change in amperes per second. It appears that you are using AdBlocking software. The inductance of a wire loop is a common example of a circuit with inductance. Apply Faraday’s law, which is the relationship between an induced emf in a conducting loop and the rate at which magnetic flux through the loop changes. Secondary Coil Wire Weight (lbs) = pi × ((Secondary Bare Wire Diameter ∕ 2) 2) × Secondary Coil Wire Length × 3. In this paper, we offer a proposal for a new simplified method of calculating busbar inductance, the calculated results for some simple models, and applications to the analysis of stray resonance phenomena. Hence the capacitance can be expressed as; (2 f ) L 1 C = o o p π 2 (1) Where f o is the self resonant frequency. Result will display the values of Capacitance in µf and Inductance in mH. In all cases, the current is assumed to flow in the outer surface of the conductors. The formula used in this calculation is based on the Harold A. 1 metres up from the feedpoint, leaving 5 metres of wire above that. Plate Type or Rolled Capacitors The capacitance value identifies a plate capacitor. For a 15 amp circuit, you can use 14 gauge wire (in most locales). Use a powdered iron or ferrite core to wind the coil on. The Group is a global player in the infrastructure, industry, building and Local. Inductance (L):. * * Program by Steve Moshier * [email protected] THE WIRE The size of the wire (the thickness) is an important factor when designing an inductor. Calculate the line inductance/meter and capacitance/ meter !. Enter the coil length (distance from first to last winding - see diagram). superconductors) and at very high frequencies. Two wire give less inductance than one wire (or ribbon) of the sum section. ! Assume we have a transmission line in which air separated the two perfect conductors. For 25um diameter gold wire, the inductance will be approximately 1 pH for every micron of length. The magnetic field, B, exists within and outside of the wire. The simple formula for. Mutual Inductance and Inductance Calculations by Maxwell’s Method Antonio Carlos M. Baluns will not improve SWR (the exception is where a balun used as part of a matching network, i. Self Inductance Definition: Self-inductance or in other words inductance of the coil is defined as the property of the coil due to which it opposes the change of current flowing through it. Home › Ness Engineering Inc. Where L is the inductance in units called henrys. Be aware of all attributes of the circuit and do not blindly use planes. I determined the ballpark value of the required coil inductance with an on-line calculator (ref. For example, for a 1˝ long lead, 0. A handbook formula for the inductance of a single-layer circular coil. A unique case is a cubic coil whose inductance is 2/3 the reference value based on area/length. Using our Solenoid Inductance calculator you can easily find inductance of a solenoid for different configurations. They usually require you to specify your choice of wire gauge (diameter), turn pitch, coil diameter and overall length. The reactance of an inductor is: Since the frequency is just multiplied by the inductance, inductors impede high frequency signals. 0 in long and 10 mils above the plane would have an approximate inductance. 4 Given an inductive resistive circuit, CALCULATE the time constant for the circuit. Inductor design calculator solving for inductance given wire coil number of turns, core material permeability, coil area and average coil length Cylindrical Coil Inductor Design Equations Formulas Calculator Inductance. Moving between the boxes by clicking or using the 'TAB' button on your keyboard, will update the result. (b) If the current through the solenoid decreases uniformly from 10 to 0 A in 0. Two wire give less inductance than one wire (or ribbon) of the sum section. This discussion on Calculate the emf induced in an inductor if the inductance is 10H and the current is 2A in 4s. Where L is the inductance in units called henrys. Let's calculate the inductance of the coil shown in the figure above. Simply enter the inductance into the boxes below and click the CALCULATE button. Core is used in the inductors to make them compact and with fewer turns of wire. How to Calculate Electrical Winding Wires by Weight & Length. The energy stored is a function of the volt-seconds per turn applied to the windings. Self and Mutual Inductance of a Pair of Parallel Rectangular Bars. Inductance For a forward converter it is generally preferable to have as much inductance as possible. Cloud based - any device, anywhere. The following calculator computes the resistance, inductance, inductive reactance, capacitance, charging current, and surge impedance for medium voltage shielded power cables. Let's take this just a step further, and use an equation for wire inductance:. The self inductance of a straight wire at high frequency is: Where d is the diameter in cm. Transformer Calculation is program for calculating number of coils and wire thickness at transformer. A user enters the coupling coefficient, K, inductor L1, and inductor L2, and the result will automatically be calculated and shown. calculate the inductance of twin lead. known, it is easy to calculate the inductance L using equation (7). 260°C compatible. Induction Motor Calculator. Calculate the inductance of a coil as an educational exercise or if you expect someday to build a radio from spare parts. Bending a straight piece of wire into a loop or coil has what effect on the inductance of the wire? Doubling the number of turns in a coil has what effect on the inductance of the coil? Decreasing the diameter of a coil has what effect on the inductance of the coil?. When you wrap a coil, the wire is also being stretched, increasing resistivity. A passive crossover has no active filters as were used in the electronic crossover. Electric Wire Cross-Section Equations. Figure 1 and Figure 2 are the basic structure and the schematic symbol of the Inductor. 3 Calculate the PCB trace inductance, or "L," using the formula L = Zo * DLY. Ferrite inductors have a ferrite core. Enter frequency in Hertz (not kHz). What is the ratio of the number of turns on the primary coil to the number of turns on the secondary coil of the transformer you are using?. 035mm) The original for this formula is by F. Inductors and Inductance - Duration: Faster than a calculator | Arthur Benjamin Electromagnetism #43 Inductance of Two Wire Line | Inductor - Duration:. It is always best to use the thickest wire for the application. Twin Wire Inductance Calculator : Choose units for a and d. Parallel Wire Impedance, Inductance, Capacitance and Propagation Delay Calculator. In Figures 1,36,54, the magnetic flux created by the forward current in the first wire is partially cancelled by the magnetic flux created by the current flowing in the opposite direction in the other wire. The signal trace in this example merely pops from one side of a solid plane to the other. Wirebond inductance. News from the world of electronics, editorial insights, technical articles. If current I passes through a circular loop of radius R,then what will be the self inductance of that loop? (calculating flux through the loop leads to calculating magnetic field at every point inside the loop which is an elliptic integral. The inductor will act purely resistive, with a high impedance at the SRF point. 10 s, what is the emf induced between the ends of the solenoid?. It appears that you are using AdBlocking software. Like self-inductance, mutual inductance is measured in Henry (H). 7497x 10-4 N0. The insulation material are somewhat different. i make that circuit with another ratings of mosfet, problem is that when i connected the load ,voltage decreases simultaneously from transformer output. For rolled capacitors, multiply the capacitance by 2. You'll need to read the peak current in amperes and the amount of time between voltage pulses in microseconds. The calculator assumes copper wire for resistance and voltage calculations. A good rule of thumb is that for one-mil wire bonds (25 micron diameter), length in millimeters is nearly equal to inductance in nano-henries. calculate the inductance of circular wire loop. We can talk about inductance from pieces of wire to complex inductors. Impedance and voltage drop to IEC 60909 and CENELEC CLC/TR 50480. This allows low frequency signals to pass with minimal attenuation. Let’s determine the inductance of this structure! First, we recall that inductance is the ratio of the current and. Quickly find parts with the highest Q at your inductance & frequency Highest Inductance Finder Find parts with the highest L value within your size constraints. In general, the capacitance is inversely proportional to the distance between the conductors. Hello dear PF-members! :shy: I'm looking for some appropriate formula which could be utilized to calculate the magnetic field density in a straight high voltage AC mere cable. The above curves represent the locus of points up to which effective permeability remains constant. DC-Circuits > Inductor in a DC Circuit. The loop self-inductance of a circular loop is really the number of rings of magnetic field lines surrounding the wire – which also happen to pass through the center of the loop – per amp of current in the loop. For example, a 200um wire will have 200 pH inductance. Sinha, Department of Electrical Engineering,IIT Kharagpur. The algorithm is based on an integral solution starting from Biot–Savart's law and allows a fast calculation of the coil inductance. B) For this time, calculate the mutual inductance of the two solenoids; C) For this time, calculate the emf induced in the outer solenoid by the changing current in the inner solenoid. Nt=number of turns, a=loop radius and R=wire radius. L=500um is very long, may be too long. We can talk about inductance from pieces of wire to complex inductors. What is the total resistance in a single phase or 2 – wire dc line? a. 6 north poles and 6 south poles. The transmission line geometries are cross sections and the values calculated are the inductance per unit length. For the rest of this book, we will assume that this self-inductance is negligible. Capacitance - the amount of electrical charges an isolated conductor can hold. 10 s, what is the emf induced between the ends of the solenoid?. Self Inductance Definition: Self-inductance or in other words inductance of the coil is defined as the property of the coil due to which it opposes the change of current flowing through it. Online calculator that allows you to calculate the self inductance of electrical wire. at its 120th page. The inductor impedance calculator calculates the impedance of an inductor based on the value of the inductance, L, of the inductor and the frequency, f, of the signal passing through the inductor, according to the formula, XL= 2πfL. The cost of running this website is covered by advertisements. Inductors, also know as choke, coil, or reactor is a passive electrical component that stores energy in its magnetic field. It is typically about a 100:1 turns ratio. Welcome to Thought Mountain's Inductor Calculator! An inductor is a coil of wire around some core.