The heat developed in an electric wire of resistance $R$ by a current $I$ for a time $t$ is
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(a) $P=\frac{E}{t}$
$E=p \times t$
$P=\frac{v^{2}}{R}=I^{2} R$
$E=I^{2} R \times t$ Jonle
$'J=\frac{1}{4.2}cal$
$E=\frac{I^{2} R\times t}{4.2} cal$
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