Difference between revisions of "Electrical Appliance"
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: The amount of [[energy]] an '''appliance''' uses depends on the power rating and how long the '''appliance''' is used for. | : 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-hour]]s. | : [[Energy]] usage for '''appliances''' is measured in [[kilowatt-hour]]s. | ||
| + | |||
| + | {| class="wikitable" | ||
| + | |+ The Power ratings of some electrical appliances. | ||
| + | |- | ||
| + | | style="height:20px; width:200px; text-align:center;" |Filament Bulb | ||
| + | A 60[[Watt]] filament bulb may be used for 8 hours a day. Calculate the [[energy]] in kilowatt-hours. | ||
| + | | style="height:20px; width:200px; text-align:center;" |Energy Saving Bulb | ||
| + | A 25[[Watt]] energy saving bulb may be used for 8 hours a day. Calculate the [[energy]] in kilowatt-hours. | ||
| + | | style="height:20px; width:200px; text-align:center;" |Kettle | ||
| + | A 2000[[Watt]] kettle may be used for 30 minutes a day. Calculate the [[energy]] in kilowatt-hours. | ||
| + | |- | ||
| + | | style="height:20px; width:200px; text-align:center;" | | ||
| + | Energy = Power x time | ||
| + | Power = 60W = 0.060kW | ||
| + | Time = 8 hours | ||
| + | Energy = 0.060 x 8 | ||
| + | Energy = 0.48kilowatt-hours | ||
| + | |||
| + | | style="height:20px; width:200px; text-align:center;" | | ||
| + | Energy = Power x time | ||
| + | Power = 25W = 0.025kW | ||
| + | Time = 8 hours | ||
| + | Energy = 0.025 x 8 | ||
| + | Energy = 0.20kilowatt-hours | ||
| + | |||
| + | | style="height:20px; width:200px; text-align:center;" | | ||
| + | Energy = Power x time | ||
| + | Power = 2000W = 2.0kW | ||
| + | Time = 30 minutes = 0.5hours | ||
| + | Energy = 2.0 x 0.5 | ||
| + | Energy = 1.0kilowatt-hours | ||
| + | |- | ||
| + | | style="height:20px; width:200px; text-align:center;" |Television | ||
| + | A 250[[Watt]] television is left on for 3 hours each day. | ||
| + | | style="height:20px; width:200px; text-align:center;" |Refrigerator | ||
| + | A 200[[Watt]] refrigerator is on for 24 hours each day. | ||
| + | | style="height:20px; width:200px; text-align:center;" |Oven | ||
| + | A 2500[[Watt]] television is left on for 45 minutes each day. | ||
| + | |- | ||
| + | | style="height:20px; width:200px; text-align:center;" | | ||
| + | Energy = Power x time | ||
| + | Power = 250W = 0.25kW | ||
| + | Time = 3 hours | ||
| + | Energy = 0.25 x 3 | ||
| + | Energy = 0.75kilowatt-hours | ||
| + | |||
| + | | style="height:20px; width:200px; text-align:center;" | | ||
| + | Energy = Power x time | ||
| + | Power = 200W = 0.20kW | ||
| + | Time = 24 hours | ||
| + | Energy = 0.20 x 24 | ||
| + | Energy = 4.8kilowatt-hours | ||
| + | |||
| + | | style="height:20px; width:200px; text-align:center;" | | ||
| + | Energy = Power x time | ||
| + | Power = 2500W = 2.5kW | ||
| + | Time = 45 minutes = 0.75 hours | ||
| + | Energy = 2.5 x 0.75 | ||
| + | Energy = 1.875kilowatt-hours | ||
| + | |} | ||
Revision as of 18:00, 7 October 2018
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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 |
 |
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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. |
|
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. |
|
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 |