alleryStart learning →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)_
Keep practising Electricity
Browse all Electricity questions for Karnataka SSLC (Class 10), or explore more Science topics.
Related questions
If the resistance of a component is kept constant and the voltage across it is doubled, thThe commercial unit of electrical energy, '1 unit', isA potential difference of 12 V is applied across a $4\ \Omega$ resistor. The current throuJoule's law of heating states that the heat produced in a resistor isTwo resistors, each of resistance $R$, are connected in parallel. Their equivalent resistaFor resistors in parallel, the reciprocal of the equivalent resistance equalsWhen three resistors are connected in series, the equivalent resistance isWhich material is used for the heating element of appliances like electric irons because o