alleryAccording to Joule's law of heating, the heat produced in a resistor R carrying current I for time t is given by which expression?
AH = IRt
BH = I²R/t
CH = IR²t
DH = I²Rt
Answer & Solution
Correct answer: D. H = I²Rt
1. Start from heat as power times time: $H = P \times t = V I t$.
2. By Ohm's law $V = IR$, so $H = (IR) I t$.
3. This gives $H = I^2 R t$, which is Joule's law of heating.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 4 "Effects of Electric Current", p.57_
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