Electrical Appliance
Contents
Key Stage 2
Meaning
An electrical appliance is anything that needs electricity to work.
About Electrical Appliances
- Electrical appliances often have a plug to use the Mains Electricity.
- Some electrical appliances use electrical cells to power them.
Examples
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| Kettle | Television | Refrigerator | Toaster |
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| Oven | Microwave | Washing Machine | Hair Dryer |
Key Stage 3
Meaning
An electrical appliance is anything that needs electricity to work.
About Electrical Appliances
- Electrical appliances often have a plug to use the Mains Electricity.
- Some electrical appliances use electrical cells to power them.
Power Ratings
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| Filament Bulb ~ 60Watts | Energy Saving Bulb ~ 25Watts | Vacuum Cleaner ~ 800Watts | Iron ~ 1100Watts |
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| Kettle ~ 2000Watts | Television ~ 250Watts | Refrigerator ~ 200Watts | Toaster ~ 1500Watts |
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| 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.
| 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. |
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Energy = Power x time Power = 60W = 0.060kW Time = 8 hours Energy = 0.060 x 8 Energy = 0.48kilowatt-hours |
Energy = Power x time Power = 25W = 0.025kW Time = 8 hours Energy = 0.025 x 8 Energy = 0.20kilowatt-hours |
Energy = Power x time Power = 2000W = 2.0kW Time = 30 minutes = 0.5hours Energy = 2.0 x 0.5 Energy = 1.0kilowatt-hours |
| Television
A 250Watt television is left on for 3 hours each day. |
Refrigerator
A 200Watt refrigerator is on for 24 hours each day. |
Oven
A 2500Watt television is left on for 45 minutes each day. |
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Energy = Power x time Power = 250W = 0.25kW Time = 3 hours Energy = 0.25 x 3 Energy = 0.75kilowatt-hours |
Energy = Power x time Power = 200W = 0.20kW Time = 24 hours Energy = 0.20 x 24 Energy = 4.8kilowatt-hours |
Energy = Power x time Power = 2500W = 2.5kW Time = 45 minutes = 0.75 hours Energy = 2.5 x 0.75 Energy = 1.875kilowatt-hours |