CRCT Review

Electricity & Magnetism

What is voltage?

• A) a measure of electric current.• B) a kind of static electricity.• C) a kind of current electricity.• D) a measure of potential energy.

Which of these is an insulator?

• A) a copper wire• B) a silver spoon• C) a plastic coating on a wire• D) an aluminum coating on a wire.

What is the purpose of a switch in an electric circuit?

• A) to change the direction of the current• B) to provide a push for the current• C) to allow the electric circuit to be opened or

closed• D) to increase the electric power to the load

In a circuit, a battery is ______.

• A) a conductor• B) an energy source• C) a load• D) an insulator

When a switch connects two parts of a circuit, the circuit is _____.

• A) series• B) parallel• C) open• D) closed

Which of these is NOT part of an electric circuit?

• A) magnet• B) conductor• C) load• D) switch

A string of lights is lit. They are part of a series circuit. One of the bulbs is removed. The rest of the lights will __.

• A) get brighter• B) get dimmer• C) go out• D) stay lit

How is electric force similar to magnetic force?

• A) both are produced by charged particles• B) both can act over a distance without direct

contact• C) both can cause a static discharge• D) both can attract iron

Which of the following could be used as the core of a simple electromagnet?

• A) pencil• B)drinking straw• C) iron nail• D) aluminum foil

Electricity is a type of ______.

• A) energy• B) machine• C) matter• D) light

A balloon is rubbed all over with wool. The balloon will now attract the wool because the balloon and the wool…

• A) are magnets• B) have opposite charges• C) have like charges• D) have neutral charges

What is another name for a battery?

• A) Electrode• B) Energizer• C) Cell• D) Electrolyte

What kind of current does a battery produce?

• A) Primary current• B) Secondary current• C) Alternating current• D) Direct current

What parts make up a circuit?

• A) electrons and wires• B) wires, power source, and load• C) power source and electrons• D) wires and electrons

What are the two types of circuits?

• A) series and parallel• B) right and left• C) AC and DC• D) open and closed

What kind of current do we get from a power plant?

• A) Primary current• B) Secondary current• C) Alternating current• D) Direct current

Five light bulbs are connected in a series circuit. Are they…?

• A) all lit the same.• B) all becoming dimmer.• C) half lit half not lit.• D) all burned out.

A student makes a parallel circuit. If one light goes out, what happens to the other lights?

• A) The others stay lit• B) The others go out• C) The others get brighter• D) The others get dimmer

What happens if you cut a magnet in half?

• A) It is no longer a magnet.• B) It still has a North and South pole.• C) It only has a North pole.• D) It only has a South pole.

If you push one magnet toward the other what will happen?

A)The magnets will pull toward each other.

B)The magnets will push away from each other.

C)The magnets will slide past each other.

D)The magnets will stick to each other.

Surrounding every magnet is its magnetic __________.

• A) Force• B) field• C) poles• D) lines

The Earth’s inner iron core spins and acts as a magnet so that all compasses point __________.

• A) North• B) South• C) East• D) West

What force exists between the poles of the two magnets in the picture?

A) Electric force of attraction

B) Electric force of repulsion

C) Magnetic force of attraction

D) Magnetic force of repulsion

What is the purpose of an iron core in an electromagnet?

• A) to hold the loops of wire in place.• B) to make the magnetic force stronger• C) to change the direction of the electric

current.• D) to change the direction of the magnetic

force.

How did scientists discover electric currents create a magnetic field?

• A) They put a compass next to a live wire.• B) They saw a magnetic field glow in the dark.• C) They watched the northern lights and knew

it was the Earth’s magnetic field.• D) They moved a magnet in a wire to make

electricity.

Who discovered that you could make electricity from spinning a magnet inside a wire coil?

• A) Thomas Edison• B) Hans Oersted• C) Michael Faraday• D) Abraham Lincoln

In which of the following items would you find an electromagnet?

• A) junkyard crane• B) on a refrigerator• C) in a pen• D) in a battery

How is electricity related to magnetism?

• A) They are the same thing.• B) They exert forces on each other.• C) They have nothing to do with each other.• D) One gets stronger as the other gets weaker.

Jane puts the north pole of a bar magnet near an object on her desk. As the magnet

gets closer it moves away. Which of the following statements is true?

• A) The object has a north pole, but no south pole.• B) the object is a magnet or has been magnetized.• C) The object has randomly-arranged domains.• D) The object is not made of metal.