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Description
Flashcards by Daniel Tenadu, updated more than 1 year ago
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Created by Alex Howard
over 8 years ago
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Copied by Daniel Tenadu
over 8 years ago
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| Question | Answer |
| What is the equation for power? | power = voltage x current |
| What are the disadvantages of wind turbines? | Spoil the landscape, need a high wind speed, take up a large area. |
| What is the difference between direct current (DC) and alternating current (AC)? | Direct current has a voltage which is always the same. It is always in one direction. Alternating current has a voltage that switches smoothly between positive and negative values. |
| Why does the National Grid use transformers? | If you increase the voltage, the current decreases. The lower the current, the less heat is produced (hence reducing energy lost). |
| Name examples of non-renewable energy sources. | Coal, crude oil, natural gas. |
| How can you detect nuclear radiation? | Using a Geiger-Muller (GM) tube. |
| What is decommissioning? | Taking a building down after usage. |
| What are some advantages of wind turbines? | It is a renewable energy source and there is no chemical pollution/waste |
| What is the equation for efficiency? | Efficiency = Useful energy output ÷ Total energy input |
| What are three examples of greenhouse gases? | Carbon Dioxide Water Vapour Methane |
| How do photocells work? | Photocells are devices that transfer light energy directly into electrical energy. They produce DC - direct current - electricity. |
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