4th Grade Science SOL 4.3

Why do electricians always wrap wires in plastic?

• Plastic is a good electrical insulator.
• Plastic is a good electrical conductor.
• Plastic comes in many different colors.
• Plastic makes the wire easy to bend.

An eraser is an example of--

• an insulator
• a conductor
• an open circuit
• a closed circuit

A nail is an example of --

• a conductor
• an insulator
• a magnet
• a proton

Concerning electricity, metal objects are--

• conductors
• insulators
• neutral
• negative

A metal paper clip is an example of --

• a conductor 
• an insulator
• a proton
• an electon

Why is copper wire used by electricians when they create electrical circuits in homes?

• Copper is a great electrical conductor.
• Copper is a great electrical insulator.
• Copper is very expensive to use.
• Copper is inexpensive to purchase.

An electrician is putting up a new dining room light.  What is the best material to use for conducting electricity to the light?

• Copper
• Plastic
• Cotton
• Rubber

Why is a bulb brighter when it is powered by two batteries rather than one?

• The flow of electricity in the circuit is greater.
• The flow of electricity in the circuit is less.
• The flow of electricity in the circuit is the same.
• The bulb will not glow brighter with two batteries.

A science class is experimenting with electrical circuits.  They connected two bulbs across two batteries to make a simple circuit.  What could they do to make the bulbs dimmer?

• Replace one of the batteries with wires.
• Replace one of the bulbs with a wire.
• Replace one of the batteries with a cork.
• Replace one of the batteries with a string.

What type of circuit has a broken path that does NOT let current flow through it?

• Open circuit
• Closed circuit
• Toggle
• Switch