![]() ![]() The number of windings in the secondary coil determines the strength of the electromotive force. This is because the strength of the magnetic field depends on the number of windings in the primary coil. Then the only thing that matters is the ratio of the number of windings between the primary and secondary coil. In an idealized picture, we disregard all potential losses and assume that all the magnetic field from the primary coil passes through the secondary coil. ![]() If you're surprised that a magnetic field can transfer energy, you might check the energy density equation calculator. ![]() You can learn more about inductance by checking out the solenoid inductance calculator: it covers the physical principles behind this intriguing phenomenon.Ĭoming back to the transformer, essentially, the magnetic field transfers the energy from one circuit to the other. This magnetic field induces a voltage difference - an electromotive force - in the secondary coil. Note: The magnetic field in a solenoid is maximum when the length of the solenoid is. where, o is the permeability constant with a value of 1.26 × 10 6 T/m, N is the number of turns in the solenoid, I is the current passing through the coil, L is the coil length. The AC current running through the primary coil creates a varying magnetic field according to the rules we explored in the magnetic field of a wire calculator. The magnetic field of a solenoid is given by the formula: B oIN/L. A transformer is essentially just two coils, primary and secondary, that are placed next to each other. ![]()
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