4.6BC Electricity, Conductors, and Insulators

All of the objects below are conductors of electricity EXCEPT–

• an aluminum nail

• a rubber band

• a copper penny

• a steel fork

Students hooked up a battery and bulb with wires as shown

• conductor of electricity.

• made of plastic or wood.

• at room temperature.

• an electrical insulator.

Elijah places four different materials at the same temperature onto a hot plate to find out which material is the best insulator. The information presented in the table shows the temperature of each material after 15 minutes.

Elijah can conclude that which of the following materials is the best insulator?

• Material 1

• Material 2

• Material 3

• Material 4

The illustration shows a circuit with a battery, a bulb, and an open switch, all connected with wires.

This electric circuit can be completed by–

• unscrewing the light bulb.

• closing the switch.

• cutting the wires.

• reversing the battery.

Which of these would be a good insulator of electricity?

• 
  Steel

• Rubber

• Copper

• 
  Aluminum

Joshua is making a trivet. A trivet is placed on a table beneath a hot pot.

He knows that he must choose
something that will NOT allow heat to pass easily from the hot pot to the
table. Which material should Joshua use to make the trivet?

• 
  Wood

• Aluminum

• 
  Copper

• 
  Silicon

The diagram shows an electrical circuit with a buzzer. The students noticed that the buzzer was not making any sounds. What could be done to this circuit to make the buzzer work?

• 
  Add another battery to the circuit.

• Replace the buzzer with a smaller one.

• 
  Close the switch to complete the circuit.

• 
  
  Switch the wires to get a better connection.

The diagram shows an electrical circuit. What object could be placed in the open space between the wires to complete the circuit?

• 
  Penny

• Toothpick

• 
  Eraser

• 
  
  Crayon

The flow of electrical energy through a circuit is an

• lightning

• electric current

• water

• mechanical energy

Which of these would be a good insulator of electricity?

• Steel

• Rubber

• Copper

• Aluminum