Electromagnetic Induction

These flashcards cover key vocabulary and concepts related to electromagnetic induction, transformers, and inductors.

Electromagnetic Induction

The process by which a changing magnetic field induces a voltage in a conductor.

Faraday's Law

States that the induced electromotive force (e.m.f.) is proportional to the rate of change of magnetic flux.

Lenz's Law

Indicates that the direction of the induced current is such that it opposes the change in magnetic flux that produced it.

Transformer

A device that uses electromagnetic induction to change the values of alternating voltages.

Step-up Transformer

A transformer where the secondary voltage is greater than the primary voltage.

Step-down Transformer

A transformer where the secondary voltage is less than the primary voltage.

Voltage Ratio

The ratio of primary voltage to secondary voltage in a transformer.

Inductance

The property of a coil that determines the amount of voltage induced for a change in current.

Induced Voltage Formula

V_{ind} = B l v, where B is the magnetic flux density, l is the length of the conductor, and v is the relative speed.

Energy Stored in Inductor

Calculated using the formula W = rac{1}{2} L I^2, where L is inductance and I is the current.