Term
| What are the energy changes in an electric motor?
[image]
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Definition
| Electrical energy into kinetic energy (sound and heat are also produced but are not wanted) |
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Term
| What are the energy changes in a petrol motor?[image] |
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Definition
| Chemical energy (from the fuel) into kinetic energy (sound and heat are also produced but are not wanted) |
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Term
| What are the energy changes in an electric iron?[image]
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Definition
| Electrical energy into heat energy |
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Term
| What are the energy changes that occur when you strike a match?
[image]
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Definition
| Chemical energy (stored in the match-head) into heat and light energies. |
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Term
| What are the energy changes in a television set?
[image]
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Definition
| Electrical energy into light energy and sound energy (heat is also produced but is not wanted) |
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Term
| What are the energy changes in a car (or automobile)?[image]
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Definition
| Chemical energy (from the petrol) into kinetic energy (sound and heat are also produced but are not wanted).
The car also has an electrical transmission system - in this the chemical energy from the battery changes into electrical energy (with heat as a by-product in the wiring). This then changes into light in the lamps (with a heat by-product).
The heat by-products are often made use of in the car's heating system. |
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Term
| What are the energy changes when a lump of coal is burned?[image]
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Definition
| Chemical energy into light and heat. Sound is also produced but not wanted |
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Term
| What are the energy changes when oil is burned?[image]
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Definition
| Chemical energy into light and heat. Sound is also produced but not wanted |
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Term
| What are the energy changes in a dynamo?
[image] |
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Definition
| Kinetic energy into electrical energy. Heat from friction and sound are also produced but not wanted! A dynamo lets you power your bicycle lighting by pedal-power! |
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Term
| What are the energy changes in a battery?[image] |
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Definition
| Chemical to electrical - heat is also produced but not wanted. |
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Term
| What are the energy changes in a torch?[image]
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Definition
| Chemical energy (from the battery) into electrical energy (heat is also produced but not wanted) into light and more unwated heat in the bulb. |
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Term
| What are the energy changes in windfarm?[image] |
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Definition
| Kinetic energy (from the wind) transferred to electrical energy (in the generators). There is also some unwanted heat and sound enegy produced. |
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Term
| What are the energy changes in an electric elevator (lift)?[image] |
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Definition
| Electrical energy into kinetic energy into gravitational potential energy (also some unwanted heat and sound energy is produced) |
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Term
| What are the energy changes in a lamp?[image] |
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Definition
Electrical energy into light and unwated heat energy in the bulb.
Most light bulbs are less than 10% efficient! |
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Term
| What are the energy changes in a catapult?[image] |
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Definition
| Elastic potential energy (sometimes called stretch energy) into kinetic energy - some unwanted heat and sound is also produced. |
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Term
| What are the energy changes in a human being?[image]
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Definition
| Chemical energy (from food and water) into heat and sound and kinetic energy. Sometimes the person uses the chemical energy to transfer into gravitational potential energy (by climbing stairs for example!). |
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Term
| What are the energy changes in a tree?[image] |
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Definition
| Light energy into chemical energy (by photosynthesis. |
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Term
| What are the energy changes in an electric drill?[image] |
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Definition
| Electrical energy into kinetic energy (also unwanted heat and sound energy are produced). |
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Term
| What are the energy changes in a washing machine?[image] |
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Definition
| Electrical energy into kinetic energy (turning the drum - accompanied by frictional heat (not wanted as it is not heating the water) and sound energy!) and heat energy (to heat the water) |
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Term
| What are the energy changes in a toaster?[image] |
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Definition
| Electrical energy to heat energy (and unwanted light energy) |
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