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Description
Flashcards by Yonis Abdi, updated more than 1 year ago
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Created by Yonis Abdi
over 8 years ago
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| Question | Answer |
| Unit 5.2 - Energy Efficiency | |
| Wat is energy efficiency? | The proportion of useful energy output from a device compared to the amount of energy that is input (expressed as a percentage). |
| What is useful energy? | The amount of energy that is actually used in work. |
| What is wasteful energy? | The energy that is lost. |
| What is the initial energy in using a toothbrush? | Electric energy |
| What is the useful energy produced? | Kinetic energy |
| What is the wasted energy? | Heat and sound energy. |
| What is initial energy in playing cricket? | chemical energy |
| Useful? | Kinetic |
| Wasted? | Heat and sound |
| Initial energy when using an iPad? | Chemical energy |
| Useful? | Sound and light energy |
| Wasted? | Heat energy |
| Initial energy when using a torch? | Chemical |
| Useful? | Light energy |
| Wasted? | Heated energy |
| What is energy rating label? | A label showing a number of stars which can be used to compare the energy efficiency of different appliances. |
| What type of energy is often listed as wasted energy? | Heat energy |
| What is insulation? | Material placed in ceilings and between the walls of a house to reduce heat transfer. |
| Banana | Rice |
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