Electric and Sound Energy

Why are wires coated with plastic?

• The plastic acts as a switch to turn on/off electrical current.

• The plastic conducts the electric current.

• The plastic insulates the electric current.

• The plastic looks better than the regular wire.

Mrs. Patrick created the instrument shown. Which straw should she blow into the to make the highest pitch?

• The longest straw.

• The shortest straw.

• Any of the green straws.

• The straw in the middle.

Which circuit will light the light bulb?

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In a circuit with wire, a battery, and a light bulb, what is the purpose of a battery in a circuit?

• It is an energy source for the light bulb.

• It turns the light bulb on.

• It acts as a switch.

• It insulates the electrical current.

What could be placed in the opening of the circuit to turn the light bulb on?

• A plastic straw.

• A rubber eraser.

• A metal brad.

• A wooden block.

Why do circuits need wires?

• The wire acts as an insulator for the electric current.

• The wire is the source of energy for the circuit.

• The wire is the conductor of the electric current.

• The wire changes the energy to light energy.

Which of the following would be a good set of conductors for electrical energy?

• nail, magnet, copper

• eraser, plastic comb, wooden spoon

• copper, nail, wooden toothpick

• wooden spoon, magnet, plastic spoon

Mrs. Halliburton grouped different objects together.

Group A: Copper, Iron, Steel, Gold

Group B: Wood, Glass, Plastic, Fabric

What would be a good title for Group B?

• Conductors

• Magnets

• Insulators

• Liquids

Which of the following would produce sound?

• a block sitting on a desk

• a radio turned off

• opening an old, squeaky door

• a light bulb burning

Which of the following describes a conductor?

• Stops the flow of electric current.

• Allows energy to pass through.

• Creates energy.

• Can be made from glass.