Which of these circuits would turn on the light?

• A

• B

• C

• D

On a cold day, an electric heater can provide warmth. Which of these best demonstrates how the electric heater produces thermal energy?

• Electricity flows through the wires in the heater and produces thermal energy.

• The wires in the heater absorb the cold in the room.

• A fan in the electric heater creates thermal energy as it moves the air.

• The wires produce thermal energy when electricity stops flowing through them.

Look at the image. Choose the words in the correct order to finish the sentences.

When the switch is in the On position, the light bulb is ​ (a)   .

• a closed circuit
• an open circuit

Look at the image. Choose the words in the correct order to finish the sentences.

When the switch is in the Off position, the light bulb is not lit because it is ​ (a)   .

• an open circuit
• a closed circuit

A student wants to demonstrate how electrical energy travels to produce energy. The student has a small, battery-powered heater. Describe the complete path that electricity follows, starting at the battery, when the heater is running.

Electricity starts at the ​ (a)   , flows through ​ ​ (b)   to produce ​ (c)   energy and returns to the battery.

• wire
• battery
• thermal