Recall that V=IR and P=VI. How much power must a 5 V battery provide to drive a 25 Ohm load?

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Multiple Choice

Recall that V=IR and P=VI. How much power must a 5 V battery provide to drive a 25 Ohm load?

Explanation:
With a 5 V source across a 25 Ω load, start by finding the current: I = V/R = 5/25 = 0.2 A. Then power is P = V × I = 5 × 0.2 = 1 W. You can also verify with P = V²/R = (5)²/25 = 25/25 = 1 W or P = I²R = (0.2)² × 25 = 0.04 × 25 = 1 W. So the battery must provide 1 watt of power.

With a 5 V source across a 25 Ω load, start by finding the current: I = V/R = 5/25 = 0.2 A. Then power is P = V × I = 5 × 0.2 = 1 W. You can also verify with P = V²/R = (5)²/25 = 25/25 = 1 W or P = I²R = (0.2)² × 25 = 0.04 × 25 = 1 W. So the battery must provide 1 watt of power.

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