Question

Heat of 220 J is produced each second in an 8 ohm resistor . Find the potential difference across the resistor​

Answer 1

$h = i {}^{2} rt \\ i = v \div r \\ h =( v {}^{2} \div r)t \\ v {}^{2} =( hr )\div t \\ = (220 \times 8 ) \div 1 \\ = 1760 \\ v = \sqrt{1760} \\ 41.9v(approx = 42)$

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