Electricity and Magnetism Content

Challenge 1

100

The attraction or repulsion between electric charges is called the electric__________ A. force B. discharge C. field D. current

A. force

200

What causes charges to move in a circuit? A. voltage B. energy C. electricity D. magnetism

A. voltage

300

According to Ohm’s Law, what is the resistance of a light if the voltage is 9.0 volts and the current is 0.30 amps? A. 0.033 ohms B. 2.7 ohms C. 30 ohms D. 8.7 ohms

C. 30 ohms

400

A connection that allows current to take the path of least resistance is called a A. short circuit. B. series circuit. C. parallel circuit. D. grounded circuit.

A. short circuit.

500

You can increase the strength of an electromagnet’s field by A. decreasing the current in the solenoid. B. decreasing the number of loops in the solenoid. C. using a stronger ferromagnetic material for the core. D. winding the coils more loosely.

C. using a stronger ferromagnetic material for the core.

Challenge 2

100

Clothes in a dryer acquire static cling by A. friction B. conduction C. induction D. static discharge

A. friction

200

An electric current will always follow A. the path of least resistance. B. a path toward the North Pole. C. a path toward the South Pole. D. the path that leads through insulators.

A. the path of least resistance.

300

In a series circuit with three bulbs, adding another bulb A. makes the nearest bulb brighter. B. makes some of the bulbs dimmer. C. makes all the bulbs brighter. D. makes all the bulbs dimmer.

D. makes all the bulbs dimmer.

400

What effect would a current of greater than 0.2 amps have on your body? A. It would be almost unnoticeable. B. It might cause an irregular heartbeat and disrupt the flow of blood. C. It could cause burns and stop your heart. D. It would feel like a shock you get from touching a doorknob.

C. It could cause burns and stop your heart.

500

What is used to turn the pointer of a galvanometer? A. a crank B. an electric current C. a bar magnet D. a battery

B. an electric current

Challenge 3

100

Materials that allow the charges of an electric current to move freely through them are called A. insulators B. conductors C. resistors D. magnets

B. conductors

200

According to Ohm’s Law, resistance is equal to voltage divided by A. time B. conduction C. current D. potential

C. current

300

Which best describes a parallel circuit? A. There is more than one bulb in the circuit. B. The bulbs are located on the same branch. C. There is only one path for current to take. D. There is more than one path for current to take.

D. There is more than one path for current to take.

400

The interaction of magnetic and electric forces result in the production of a (n) A. current. B. electromagnetism. C. solenoid. D. voltage.

B. electromagnetism.

500

What device transforms electrical energy into mechanical energy? A. an electromagnet B. an electric motor C. a generator D. a solenoid

B. an electric motor