Electricity and Magnetism Review

Front

What does a transformer actually transform?

Back

Voltage.

Front

What two forces are required for generators and electric motors to work?

Back

Electricity and magnetism.

Front

How are electromagnets different from permanent magnets?

Back

You can turn an electromagnet on/off.

Front

What device converts kinetic energy into electrical energy?

Back

Electric generator.

Front

What happens to the induced voltage if the number of coils doubles when a magnet is moved in and out of a coil of wire?

Back

The induced voltage doubles.

Front

Define electromagnetism.

Back

The interaction of electric currents or fields and magnetic fields.

Front

What is electromagnetic induction?

Back

The process of generating electric current from a changing magnetic field.

Front

What is the role of a commutator in an electric motor?

Back

It reverses the direction of current flow to maintain rotation.

Front

What is the difference between AC and DC current?

Back

AC (Alternating Current) changes direction periodically, while DC (Direct Current) flows in one direction.

Front

What is Faraday's Law of Electromagnetic Induction?

Back

The induced electromotive force in any closed circuit is equal to the rate of change of the magnetic flux through the circuit.