Electromagnetic Induction Lectures

These flashcards cover key concepts related to electromagnetic induction, its laws and applications, derived from the lecture notes.

Electromagnetic Induction

The process by which a changing magnetic field induces a voltage difference (EMF) in all materials, causing current to flow in a conductor.

Electromotive Force (EMF)

The induced voltage difference, distinct from battery voltage, denoted as ε and related to the number of loops and speed of change in the magnetic field.

Lenz's Law

A principle stating that a changing magnetic field induces a current, which in turn creates a secondary magnetic field that opposes the original magnetic field.

Consequences of Lenz's Law

A greater force is required to move a magnet through coils or to push it faster, due to the resistive force that opposes the motion.

The Electric Generator

A device that transforms kinetic or mechanical energy into electrical energy by moving wires within a magnetic field, generating AC or pulsed DC.

Maxwell's Discovery of Light

Redefined electrical and magnetic discoveries showing that changing electric fields generate changing magnetic fields and vice versa, with light being regenerating fields at 300,000 km/s.

Applications of EM Induction

Includes practical uses such as induction loops at traffic lights, metal detectors, wireless charging, and maglev trains.

AC (Alternating Current)

Electric current that reverses direction periodically, generated by devices like electric generators.

Pulsed DC (Direct Current)

A form of electric current that flows in one direction but is pulsed, often generated by electric generators.

Induced Current

The current that flows in a circuit when a magnetic field changes within that circuit.