GCSE Physics revison help (electricity related)?

Keri Asked: GCSE Physics revison help (electricity related)?

I have my Physics P2 GCSE exam tomorrow (UK) and I've realise that there's some stuff my teacher hasnt cleared up. icon sad GCSE Physics revison help (electricity related)? please help with as many as you can, thanks!

1. What happens to resistance when voltage is increased?
2. What happens to resistance when current is increased?
3. What colour is the Earth wire in a plug and what does it do?
4. What colour is the Live wire in a plug and what does it do?
5. What colour is the Neutral wire in plug and what does it do?
6. How does an minature curcuit breaker (MCB) protect devices?
7. How does an residual current devise (RCB) protect the user?
8. What does a fuse do and what are its benefits and drawbacks?

Any of these answers would be helpful icon smile GCSE Physics revison help (electricity related)?

Answers:

Pavan Answered:
the first 2 questions can be answered based on Ohm's law V = iR (V-voltage R-resistance i-current)

1. so when voltage increases resistance will increase

2. when current increase resistance will decrease

3. the earth wire would be black

4. the live wire would be red

thats al i know



Sookara Answered:
hi it would be better if you go go to these sites, may help you,!!!!



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