A 120 Ω resistor must carry a maximum current of 25 mA. Its rating should be at least
A. 4.8 W
B. 150 mW
C. 15 mW
D. 480 mW
Answer: Option B
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One formula for power is I squared times R.
P = 0.025A^2 x 120 ohms = 0.075W or 75mW
So a resistor rated at least double that. 150mW