The formula to calculate induced EMF is as follows:
EMF = -N * dΦ/dt
In this formula:
- EMF represents the induced electromotive force, measured in volts (V).
- N denotes the number of turns in the coil or the winding.
- dΦ/dt represents the rate of change of magnetic flux, measured in webers per second (Wb/s).
The negative sign in the formula indicates that the induced EMF acts in opposition to the change in magnetic flux. This is known as Lenz’s Law, which states that the induced current or EMF will always oppose the change in the magnetic field that produced it.