electric power

Question

Power dissipated in resistor R with current I?

RankGuru · Accepted Answer

1. **Basic Definition**: Power ($P$) is the rate at which electrical energy is converted into heat (Joule heating).
2. **Formula derivations**:
   - From definition: $P = VI$
   - Substituting Ohm's Law ($V = IR$): $P = (IR)I = I^2 R$
   - Substituting $I = V/R$: $P = V(V/R) = V^2 / R$
3. **Conclusion**: According to the options provided, the power dissipated is **$I^2 R$**.

Rank Guru

electric power

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