# Electrical Appliance

## Key Stage 2

### Meaning

An electrical appliance is anything that needs electricity to work.

Singular Noun: Electrical Appliance
Plural Noun: Electrical Appliances

Electrical appliances often have a plug to use the Mains Electricity.
Some electrical appliances use electrical cells to power them.

### Examples

 Kettle Television Refrigerator Toaster Oven Microwave Washing Machine Hair Dryer

## Key Stage 3

### Meaning

An electrical appliance is anything that needs electricity to work.

Electrical appliances often have a plug to use the Mains Electricity.
Some electrical appliances use electrical cells to power them.

### Power Ratings

 Filament Bulb ~ 60Watts Energy Saving Bulb ~ 25Watts Vacuum Cleaner ~ 800Watts Iron ~ 1100Watts Kettle ~ 2000Watts Television ~ 250Watts Refrigerator ~ 200Watts Toaster ~ 1500Watts Oven ~ 2500Watts Microwave ~ 1000Watts Washing Machine ~ 2500Watts Hair Dryer ~ 600Watts

### Energy Usage of Appliances

The amount of energy an appliance uses depends on the power rating and how long the appliance is used for.
Energy usage for appliances is measured in kilowatt-hours. This means all power ratings need to be in kilowatts and time should be in hours.
Energy can be calculated with the equation: Energy = Power x time
 Filament Bulb A 60Watt filament bulb may be used for 8 hours a day. Calculate the energy in kilowatt-hours. Energy Saving Bulb A 25Watt energy saving bulb may be used for 8 hours a day. Calculate the energy in kilowatt-hours. Kettle A 2000Watt kettle may be used for 30 minutes a day. Calculate the energy in kilowatt-hours. Power = 60W = 0.060kW Time = 8 hours Energy = Power x time Energy = 0.060 x 8 Energy = 0.48kilowatt-hours Power = 25W = 0.025kW Time = 8 hours Energy = Power x time Energy = 0.025 x 8 Energy = 0.20kilowatt-hours Power = 2000W = 2.0kW Time = 30 minutes = 0.5hours Energy = Power x time Energy = 2.0 x 0.5 Energy = 1.0kilowatt-hours Television A 250Watt television is left on for 3 hours each day. Calculate the energy in kilowatt-hours. Refrigerator A 200Watt refrigerator is on for 24 hours each day. Calculate the energy in kilowatt-hours. Oven A 2500Watt oven is used for 45 minutes each day. Calculate the energy in kilowatt-hours. Power = 250W = 0.25kW Time = 3 hours Energy = Power x time Energy = 0.25 x 3 Energy = 0.75kilowatt-hours Power = 200W = 0.20kW Time = 24 hours Energy = Power x time Energy = 0.20 x 24 Energy = 4.8kilowatt-hours Power = 2500W = 2.5kW Time = 45 minutes = 0.75 hours Energy = Power x time Energy = 2.5 x 0.75 Energy = 1.875kilowatt-hours

## Key Stage 4

### Meaning

An electrical appliance is any device that needs electricity to work.

Electrical appliances often have a plug to use the Mains Electricity.
Some electrical appliances use electrical cells to power them.

### Energy Transfers

 Electrical energy transfer → Thermal Energy Store of the bulb. Electrical energy transfer → Thermal Energy Store of the bulb. Electrical energy transfer → Kinetic Energy Store of the air and the Thermal Energy Store of the motor. Electrical energy transfer → Thermal Energy Store of the metal pad. Electrical energy transfer → Thermal Energy Store of the water and kettle. Electrical energy transfer → Energy Transfer by radiation to the surroundings (by light and sound). Electrical energy transfer → Thermal Energy Store of the 'heat pump' at the back of the refrigerator. Electrical energy transfer → Thermal Energy Store of the bread/toast. Electrical energy transfer → Thermal Energy Store of the oven and food. Electrical energy transfer → Thermal Energy Store of the food. Electrical energy transfer → Thermal Energy Store of the bulb. Electrical energy transfer → Thermal Energy Store and Kinetic Energy Store of the air.

### References

#### AQA

Electrical appliances, pages 18-21, 72-73, GCSE Physics; Third Edition, Oxford University Press, AQA
Electrical appliances, power of, pages 307-8, GCSE Combined Science Trilogy 1, Hodder, AQA