Electricity and Magnetism Review

Front

What surrounds a wire when electric current is flowing through it?

Back

A magnetic field.

Front

What does Coulomb's law state about the force between two charges?

Back

The force depends directly on the size of the charges and inversely on the square of the distance between them.

Front

What does a transformer actually transform?

Back

Voltage.

Front

What is the relationship between electrical current and magnetic field strength in an electromagnet?

Back

When current is increased, magnetic field strength increases.

Front

When is the electric force between two charges strongest?

Back

When the charges are close together.

Front

Define electric current.

Back

The flow of electric charge, typically measured in amperes.

Front

What is the unit of electric charge?

Back

Coulomb (C).

Front

What is Ohm's Law?

Back

V = I × R, where V is voltage, I is current, and R is resistance.

Front

What is the principle of electromagnetic induction?

Back

A changing magnetic field can induce an electric current in a conductor.

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.