Alex looked at an electric toothbrush that had a plug with three metal prongs. Why are these prongs made out of metal?

• Metal doesn’t get hot and melt when you plug it into the outlet.

• Metal is strong and is less likely to break when you plug it into the outlet.

• Metal is an insulator and prevents shocks when you plug it into the outlet.

• Metal is a conductor and completes a circuit when you plug it into the outlet.

Which would be a good conductor of electricity?

• a rubber band

• a piece of paper

• a penny

• a mirror

What material would be safest to use as an insulator to cover electrical wires?

• Aluminum

• Tin

• Rubber

• Water

Two students design a circuit that includes a switch, a battery and light bulb all directly connected by wires. Before flipping the switch, what could the students do to BEST ensure that it will work?

• clean the wires

• check the brightness of the bulb

• reverse the direction of the wires

• make sure there is a complete path

A student is constructing four different electrical circuits. Each circuit has a battery, wires, a switch, and a light bulb. Which of the following is the best way for the student to record information so that another student can construct exactly the same four circuits?

• draw a diagram that shows each circuit

• make a tally of the parts used in each circuit

• make a list of the materials needed for each circuit

• create a graph that shows the number of parts in each circuit

Which components could complete an electric circuit?

• wire, bulb, switch

• battery, bulb, switch

• battery, wire, switch

• battery, wire, bulb

• A

• B

• C

• D

• A

• B

• C

• D

Tags

NGSS.4-PS3-2

• A

• B

• C

• D

charges that are ________________ attract each other

• metal wire

• static

• battery

• opposite

• repel