Question

Interrelation between P,V,I and R

It is 3 marks question
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Answer 1

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Answer 2

Explanation:

If I is current, V is potential and R is resistance of a circuit, the the electric power P is given by :

$P=V\times I$

Ohm's law : $V=IR$

i.e.

$P=(IR)\times I\\\\P=I^2R$

Also, $I=\dfrac{V}{R}$,

$P=V\times \dfrac{V}{R}\\\\P=\dfrac{V^2}{R}$

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