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Physics
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Physics Equations for Electrical Power
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[QUOTE="CWatters, post: 6013373, member: 423469"] I'm sitting in my car waiting for my twins to finish their GCSE physics exam so this is a bit late but... First think about _where_ the power is being dissipated. If we are talking about the power dissipated in a resistor then I and V refer to the current and voltage through and across the resistor. If you are talking about the power delivered by a battery then I and V apply to the battery. In some cases you only know one variable (I or V) so you can use.. P=IV And ohm's law V=IR To make either... P=I^2R or P=V^2/R Then which you use depends on which variable you know.One of my son's has just called to say the exam was "ok but challenging". How did you find it? [/QUOTE]
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Physics Equations for Electrical Power
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