OCR Physics P2 revision cards

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.

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	Created by Alex Howard over 10 years ago

	Copied by Disalini Rakuseelan almost 7 years ago