Emf induced in a generator coil

Definition

EMF induced in a generator coil is the voltage generated due to the relative motion between a magnetic field and the coil. This phenomenon is described by Faraday's Law of Electromagnetic Induction.

5 Must Know Facts For Your Next Test

1. The magnitude of the induced EMF is directly proportional to the rate of change of magnetic flux through the coil.
2. Faraday's Law states that $\text{EMF} = -N \frac{d\Phi}{dt}$, where $N$ is the number of turns in the coil and $\Phi$ is the magnetic flux.
3. The direction of the induced EMF opposes the change in magnetic flux, according to Lenz's Law.
4. In an AC generator, the rotation speed of the coil affects both frequency and amplitude of the induced EMF.
5. The peak value of induced EMF can be calculated using $\text{EMF}_{\text{peak}} = NBA\omega$, where $N$ is the number of turns, $B$ is magnetic field strength, $A$ is area, and $\omega$ is angular velocity.

Related terms

Faraday's Law:

States that an electromotive force (EMF) is induced in a circuit when there is a change in magnetic flux through it.

Lenz's Law:

Indicates that the direction of induced current will oppose the change causing it.

Magnetic Flux:

$\Phi = B \cdot A \cdot \cos(\theta)$; measures the quantity of magnetism, taking into account field strength and area it penetrates.