Electricity and Magnetism review CP

The force or push that causes electric charges to move is called

• resistance

• voltage difference

• current

• static electricity

Electric charges always flow from _________ areas to __________ areas

• positive, negativ

• positive, neutral

• negative, positive

• neutral, negative

Which of the following statements about electric charge is true?

• Objects must be touching on another to exert electrical force.

• Electrical forces act at a distance.

• Air cannot conduct electricity; it is conducted only by solid materials.

• Opposite electric charges always repel one another.

Which of the following will increase the resistance of a wire?

• using a thicker/wider wire

• using a shorter wire

• increasing the temperature of the wire

• using silver instead of copper

What is the current produced by a 9-volt battery flowing through a resistance of 0.2 ohms?

• 1.8 amps

• 45 amps

•  0.022 amps

• 8.8 amps

Which of the following will decrease the strength of the magnetic field around a wire?

• increasing the current flowing through the wire

• using less loops around the iron core

• flipping the direction of the current flowing through the wire

• using a larger iron core

Silver has a resistance of 0.0198 ohms.  What voltage would produce a current of 100 amps?

• 1.98 V

• 5,050 V

• 0.000198 V

• 100.0198 V

This contains a piece of metal that melts if it gets too hot in order to open a circuit

• conductor

• insulator

• fuse

• circuit breaker

The function of a generator is to change .

• chemical energy to electrical energy

• electrical energy to chemical energy

• electrical energy to mechanical energy

• mechanical energy to electrical energy

Which circuit below contains the greatest voltage?

• A circuit with a current of 20 amps and a resistance of 16 ohms

• A circuit with a current of 10 amps and a resistance of 10 ohms

• A circuit with a current of 25 amps and a resistance of 16 ohms