Electric Current and Circuits Worksheet

What distinguishes a conductor from an insulator?

• the rate that neutrons travel through the material

• the ease of flow of electrons through the material

• the amount of electrons present

• the amount of neutrons present

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After rubbing a rubber brush on wool, Gilbert is able to use the brush to pick up small strips of paper. What causes the paper to be attracted to the brush?

• gravity

• electric current

• static electricity

• magnetism

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A magnet can generate an electric current in a wire if the magnet is close enough to the wire and if the magnet is also

• strong.

• weak.

• at rest.

• in motion.

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An electric current will always follow ____.

• an open path

• the path of least resistance

• a path toward a magnetic north pole

• the path that leads through insulators

A magnetic field will be detected near this circuit only if

• the wire is made of iron.

• a current flows through the wire.

• the wire is cooled first.

• the battery contains acid.

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Would increasing the number of batteries in a circuit that is connected to a small electric motor affect the speed of the motor, if all other variables are kept constant?

• No, because it is the magnetic force, not the electric force, that controls the motor speed.

• Yes, the motor would run faster because the increased electrical force increases the magnetic force in the motor.

• No, the speed of a motor is controlled only by the number of wire coils in the motor.

• Yes, the motor would run faster because increased current causes the motor to become warmer.

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Marty rubbed a balloon on his shirt. The balloon was then able to stick to the wall of the room. Which picture best represents the charges of the particles on the balloon and the wall that cause the balloon to be attracted to the wall?

• The balloon has a negative charge and the wall has a positive charge near the balloon.

• The balloon has a positive charge and the wall has a positive charge near the balloon.

• The balloon has a negative charge and the wall has a negative charge near the balloon.

• The balloon and the wall both have no charge.

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Look at diagram A. The wall has positive charges and the balloon has positive charges as well. What is happening in this scenario and what is the interaction between the wall and the balloon?

• The wall and the balloon repel each other because like charges repel.

• The wall and the balloon attract each other because opposite charges attract.

• There is no interaction between the wall and the balloon.

• The wall and the balloon become neutral.

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Explain what is happening in this scenario and describe the interaction between the wall and the balloon.

• The balloon bounces off the wall due to the force exerted by the wall.

• The balloon passes through the wall without any interaction.

• The wall absorbs the balloon completely.

• The balloon and the wall do not interact at all.

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A device that converts mechanical energy into electricity is a

• generator.

• meter.

• motor.

• solenoid.

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