Power Dissipation

Question

A 5 Ω resistor carries a current of 4 A. What is the power dissipated in the resistor?

RankGuru · Accepted Answer

1. **Joule Heating Concept**: When current passes through a resistor, electrical energy is converted into heat (thermal energy).
2. **Power Formulas**: $P = VI$, $P = I^2 R$, or $P = V^2/R$.
3. **Calculation (using $I$ and $R$)**:
   - $P = (4 	ext{ A})^2 	imes 5 	ext{ } \Omega$
   - $P = 16 	imes 5 = 80 	ext{ Watts}$.
4. **Conclusion**: The resistor dissipates 80 Joules of energy per second as heat.

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Power Dissipation

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