Electricity Review

When Clarence pushed the button on the doorbell, what caused the clapper to hit the bell?

• Gravity

• Friction

• Magnetism

• Sound

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Malik rubbed a balloon with a wool cloth to give it an electrical charge. He placed the balloon next to a wall. The balloon stuck to the wall. Which picture shows why the balloon stuck to the wall?

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Which picture shows a circuit through which energy can flow to make the light bulb glow?

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What is the circuit shown designed to produce?

• Light energy

• Sound waves

• Heat energy

• Magnetic force

What is an insulator?

• A device that keeps too much current from flowing through wires.

• A switch that protects circuits from currents that are too high?

• A material through which current cannot easily move.

• A loop of wire that generates an alternating current.

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Which of the following electrical appliances uses electrical energy that is transformed into mechanical energy?

• oven

• lamp

• radio

• fan

Alyssa wore a hat to school. When she took the hat off, her hair crackled and stood on end. Why did removing the hat make Alyssa's hair stick out around her head?

• Alyssa's hair removed positive charges from the hat.

• The hat removed positive charges from Alyssa's hair.

• Alyssa's hair removed negative charges from the hat.

• The hat removed negative charges from Alyssa's hair.

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What would most likely cause an iron nail to become temporarily magnetized?

• electrical currents

• convection currents

• gravitational force

• solar energy

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Trevor turned on a lamp. When the light is on, electrical energy changes into what other form of energy?

• chemical

• radiant

• potential

• mechanical

An electrical component that has a continuous path for electrons to flow is called __________.

• a closed circuit

• an open circuit

• a filament

• a battery