Relation Between Watt And Volt

Watt is the unit of power. Named after James Watt. In terms of electromagnetism, it is the current flow of one ampere with a voltage of 1 volt. A volt is a derived unit for electric potential, electromotive force and electric potential difference. The relation between watt and volt is direct. Which implies that change in the value of watt will reflect in the change in the value of volt.

Watt And Volt

In physics, the relation between watt and volt can be written as- 1 watt = 1 ampere × 1 volt \(1\;volt=\frac{1\;watt}{1\;ampere}\) Where,

  • Watt is the measure of power.
  • Volt is the measure of electric potential.
  • Ampere is the measure of current.

Volt is the measure of potential difference within two terminal of a conducting wire.
Watt is the rate at which electric work is performed when a current of one ampere flows across the potential difference of one volt. The relation between watt and volt are proportionate. That is watt is directly proportional to volt. Which implies that-

  • When the electric power in terms of watt increases, the electric potential in terms of volt also increases keeping electric current constant.
  • When the electric power in terms of watt decreases, the electric potential in terms of volt also decreases keeping electric current constant.

AC and DC

The formula for watt and volt changes for Alternating current and Direct current. Follow the table given below for formula and example of the relation between watt and volt in AC and DC.

Formula Terms Example
AC PW= PF × VV × IA PW is Power in watt VV = 10V, IA=5A, PF=0.5, PW =? PW= 0.5×10VV × 5IA
PW=25W
PF is Power Factor
VV is voltage in volts
IA is current in ampere
DC PW= VV × IA PW is Power in watt VV = 10V, IA=5A, PW =? PW= 10VV × 5IA
PW=50W
VV is voltage in volts
IA is current in ampere

Hope you have understood the relation between watt and volt, the units of electricity. Also, watt and volt conversion in physics, electronics especially in electromagnetism.
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