A 220 Ω Resistor Dissipates 3 W. The Voltage Is

By Aina Parasher|Updated : July 19th, 2022

A 220 Ω resistor dissipates 3 W. The voltage is-

  1. 73.3 V
  2. 2.5 V
  3. 25.7 V
  4. 257 V

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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