Electromagnetism and Transformers Review

These flashcards cover key concepts related to electromagnetic induction and transformers, focusing on Lenz's law, transformer types, and efficiency.

What does Lenz's Law state about the direction of induced current?

The direction of induced current opposes the change in the original magnetic field.

What is induced current?

A current that is generated in a conductor when it is placed in a changing magnetic field.

What are the two types of transformers?

Step-up transformer and step-down transformer.

What is the purpose of an isolation transformer?

Used for safety reasons and to reduce electrical noise.

What does a step-up transformer do?

Increases potential difference, with more turns in the secondary coil than in the primary coil.

What does a step-down transformer do?

Decreases potential difference, with fewer turns in the secondary coil than in the primary coil.

What is mutual inductance?

Creating an EMF and current in one coil due to changing current in another coil.

What is self-inductance?

The property of a wire to create an induced EMF that opposes the change in the potential difference across the wire.

What happens to the galvanometer's needle when a magnet is moved quickly towards a coil?

The needle deflects more due to a greater induced current.

What is an ideal transformer?

A transformer that dissipates no power and is 100 percent efficient.