Question:
A current of 3 A flows through a wire of resistance 4 $\Omega$. What is the power dissipated in the wire?
A current of 3 A flows through a wire of resistance 4 $\Omega$. What is the power dissipated in the wire?
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Use the formula $ P = I^2 R $ when current and resistance are known to calculate power dissipated in a resistor.
Updated On: May 24, 2025
- 12 W
- 24 W
- 36 W
- 48 W
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The Correct Option is C
Solution and Explanation
Given:
Current $ I = 3 \, \text{A} $
Resistance $ R = 4 \, \Omega $
Formula for power dissipated in a resistor: $$ P = I^2 R $$
Substituting values: $$ P = (3)^2 \cdot 4 = 9 \cdot 4 = 36 \, \text{W} $$
Current $ I = 3 \, \text{A} $
Resistance $ R = 4 \, \Omega $
Formula for power dissipated in a resistor: $$ P = I^2 R $$
Substituting values: $$ P = (3)^2 \cdot 4 = 9 \cdot 4 = 36 \, \text{W} $$
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