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4 Cards in this Set
- Front
- Back
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Equation for efficiency
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efficiency=useful energy transferred/total energy supplied
Efficiency can be given in joules or kilojoules, or as a percentage (how much useful energy is transferred). |
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Sankey diagrams
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These show the efficiency of an appliance - they are a visual representation of how much energy is put into the appliance, how much is wasted and how much is actually put to use.
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Efficiency
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This term refers to how good an appliance is at using energy for what we want it to - this is considered useful energy. For example, a light bulb transfers some energy into light, and some into heat. We only consider the light energy to be useful in this case.
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Efficiency ratings
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All electrical appliances must now have an energy efficiency label. The label shows how much energy you would expect to use in a year. It also grades the appliance in one of seven categories, from A to G.
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