A 220 Ω Resistor Dissipates 3 W. The Voltage Is

Answer: C. 25.7 V

A 220 resistor dissipates 3 W. The voltage is 25.7 V.

Solution

Power consumption in a resistor is

P=V²/R

Given resistor is 220 Ω, power consumption is 3 W.

V²=P×R

V=√P×R

V=√3×220

V=25.7 V

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