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| Questão | Responda |
| What does most energy loss usually spread out as? | Heat energy |
| What makes a device useful? | If it can transform one form of energy into another |
| What makes a device more efficient? | The less energy it wastes |
| What is the equation for efficiency? | Efficiency= Useful energy out/ Total energy in |
| Is useful energy input equal to total energy out put? | No |
| No device is... | ... 100% efficient and the wasted energy is usually spread out as heat |
| What is the only exception to the rule 'No device is 100% efficient'? Why? | Electric heaters as all the electricity is converted into 'useful' heat energy |
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