Physical Science Exam Review

Front

What is the relationship between electric currents and magnetic fields?

Back

All electric currents produce a magnetic field.

Front

What does a capacitor do in an electrical circuit?

Back

A capacitor stores electrical energy temporarily.

Front

What is a solenoid with a ferromagnetic core called?

Back

An electromagnet.

Front

Which resistor will allow the least current to flow: 1 ohm, 100 ohms, 1000 ohms, or 0.5k ohms?

Back

1000 ohms will prevent the most current flow.

Front

How can you increase the strength of an electromagnet?

Back

By using a stronger ferromagnetic material.

Front

What is the unit of electrical resistance?

Back

Ohm (Ω).

Front

What is the function of a diode in a circuit?

Back

A diode allows current to flow in one direction only.

Front

What is the principle behind an inductor?

Back

An inductor stores energy in a magnetic field when electrical current flows through it.

Front

What happens to the magnetic field when the current in a wire is increased?

Back

The strength of the magnetic field increases.

Front

What is the difference between a series and parallel circuit?

Back

In a series circuit, components are connected end-to-end, while in a parallel circuit, components are connected across common points.