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The electric power dissipated in a resistor can be written as
A$P = V/I$
B$P = IR^2$
C$P = VI = I^2R = V^2/R$
D$P = V^2 R$
Answer & Solution
Correct answer: C. $P = VI = I^2R = V^2/R$
1. Power is energy per unit time, $P = VI$.
2. Using Ohm's law V = IR gives $P = I^2R$ and $P = V^2/R$.
3. All three forms are equivalent: $P = VI = I^2R = V^2/R$.
_Source: Karnataka SSLC (KSEEB) Class 10 Science, Ch12 'Electricity', §12.6 (power)_
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