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VOLTAGE

Voltage Calculator

Solve for voltage using Ohm's Law & Power Law — DC & AC

V = I × R V = P / I V = √(P × R)

V = I × R

Enter current and resistance to find voltage

A
Ω
Voltage (V) — V
Power — W
V = I × R

V vs R

R ↑ V ↑ V
Voltage increases linearly with resistance (constant I)

V = P / I

Enter power and current to find voltage

W
A
Voltage (V) — V
Resistance — Ω
V = P / I

V vs P

P ↑ V ↑ V
Voltage increases linearly with power (constant I)

AC Voltage

V = P / (I × PF) — enter power, current and power factor

W
A
PF
Voltage (V) — V
Apparent power (S) — VA
Reactive power (Q) — VAR
V = P / (I × PF)

AC power components

P S Q φ PF = cos φ P = real power S = apparent power
PF = P / S — lower PF means higher voltage for same P & I

V = √(P × R)

Enter power and resistance to find voltage

W
Ω
Voltage (V) — V
Current — A
V = √(P × R)

V vs R (constant P)

R ↑ V ↑ V
Voltage increases with resistance (constant power)