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A current $\text{I}$ flows through a resistor of resistance $\text{R}$ when the potential difference across it is $\text{V}$. Applying Ohm's law, write the formula for amount of heat produced by the resistor in time $\text{t}$.
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(a) A part of current is consumed into useful work and rest is expended in heat to raise the temperature of gadget.
(any other suitable explanation)
(b)
$W=V \times Q= VIt = IR \times It$
$H = I^2Rt$ / $H = \frac{V^2}{R}t$
(any other suitable explanation)
(b)
$W=V \times Q= VIt = IR \times It$
$H = I^2Rt$ / $H = \frac{V^2}{R}t$