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# What is the relationship between Voltage and Current? watch

1. Ok so I'm revising electricity and when revising circuits i learned that I and V are directly proportional according to the equation V=IR and iv characteristics however i'm really confused because while revising the national grid i'm being told that voltage and current are inversely proportional, can someone explain this to me. BTW I'm studying triple science GCSE level
2. Well another equation is P=IV (P is power) which means that if the current increases, the voltage decreases and vice versa. That’s it basically it
3. (Original post by bluemuffin)
Well another equation is P=IV (P is power) which means that if the current increases, the voltage decreases and vice versa. That’s it basically it
So there aren't set laws for this?, idk why im so confused..
4. (Original post by misspessimism)
Ok so I'm revising electricity and when revising circuits i learned that I and V are directly proportional according to the equation V=IR and iv characteristics however i'm really confused because while revising the national grid i'm being told that voltage and current are inversely proportional, can someone explain this to me. BTW I'm studying triple science GCSE level
The first equation is ohm's law, which assumes that the resistance is constant. This is not the case for a lot of components because as temperature increases, due to the current flowing, the resistance increases and the voltage dropped increases while current decreases, hence, they are inversely proportional.

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Updated: March 11, 2018
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