Energy in the home

Question 1

Explain the energy transfers in a washing machine.

Answer 1

• Charges flow in the wires of motors.
• Energy is transferred by doing electric work to the kinetic store of the motor.
• The motor moves

Question 2

What is a motor?

Answer 2

A motor is a device that converts electric energy to kinetic energy.

Question 3

Explain the energy transfers in a lamp.

Answer 3

• Charges flow through the filament bulb.
• Energy is transferred by doing electric work to the thermal store of the bulb. The bulb heats up.
• Energy transfers from the thermal store by heat and light.

Question 4

Explain the energy transfers in a kettle.

Answer 4

• Charges flow through a heating element.
• Energy is transferred by doing electrical work to the thermal store of the element. The element heats up.
  Energy transfers from the hot element to the water by heating. The water gets hot.

Question 5

Explain the energy transfers in gas.

Answer 5

• Methane gas is a fuel.
• Energy is transferred from its chemical store to the thermal store of the flame as it burns.
• Energy is transferred by heating and light from the flame to the surroundings.

Question 6

What is a power rating?

Answer 6

A power rating is the rate that a device transfers energy each second.