Electricity and Magnetism Review

Which set of magnets correctly illustrates the attraction of opposite poles?

• A

• B

• C

• D

Which of the following statements best compares the functions of parts A & C?

• Part A generates the energy needed for electricity, while part C conducts the flow of electricity.

• Part A absorbs the flow of electricity, while part C generates the energy needed for electricity.

• Part A opens and closes the flow of electricity, while part C transfers the flow of electricity.

• Part A is the device activated by the electricity, while part C controls where the electricity goes.

Which of the following statements best describes parts B & D?

• Part B is the conductor, or wire, and Part D is the battery, or load

• Part B is the circuit or conductor, and Part D is the load, or switch.

• Part B is the battery, or power source, and Part D is the bulb, or load.

• Part B is the battery, or load, and Part D is the bulb, or power source.

A series circuit contains 3 light bulbs. The switch is opened and one of the bulbs is removed, but not replaced. Then the switch is closed again. What would you expect to see?

• Both remaining light bulbs will be on

• None of the remaining light bulbs will be on

• Only the bulb closest to the switch will be on

• Both remaining bulbs will be brighter than before

Static charges can be applied to neutral objects by friction, induction, or conduction. What do all these methods utilize to create this charge?

• Protons

• Electrons

• Heat energy

• Magnetic domains

How is an electromagnet different from a bar magnet?

• Only the bar magnet has a magnetic field.

• Only the electromagnet attracts materials made of iron.

• An electromagnet is temporary and is magnetic when a current flows through a wire wrapped around the core.

• A bar magnet is temporary and is only magnetic when a current flows through a wire wrapped around the core.

A compass is an instrument that is used in navigation due to its property of pointing in what direction?

• South

• West

• North

• East

An electromagnet is created using a battery, an insulated copper wire, and an iron nail. The wire is wrapped around the nail 30 times and attached to the battery. Which pair of changes will definitely increase the strength of the electromagnet?

• Increase the voltage of the battery and decrease the number of turns of the coil.

• Decrease the voltage of the battery and decrease the number of turns of the coil.

• Increase the voltage of the battery and increase the number of turns of the coil.

• Decrease the voltage of the battery and increase the number of turns of the coil.

in this circuit, what part would be the energy source?

• Wire

• Switch

• Battery

• Light Bulb

One disadvantage of this type of circuit is that -

• The addition of new lights decreases resistance.

• As more lights are added to the circuit, the voltage of each decreases.

• As more lights are added to the circuit, the voltage of each increases.

• When the circuit to one light is turned on, the circuit to the other lights turns off.