Input Parameters
Solve For
Known Values
Supply Voltage
V
Resistors in Series
Supply Voltage
V
Resistors in Parallel
Awaiting Input
Select what to solve for, enter any two known values, and hit Calculate.
Voltage
V = I × R
—
V
Circuit Diagram
Formula Reference
Voltage
V = I × R
V = P / I
V = √(P × R)
V = P / I
V = √(P × R)
Current
I = V / R
I = P / V
I = √(P / R)
I = P / V
I = √(P / R)
Resistance
R = V / I
R = V² / P
R = P / I²
R = V² / P
R = P / I²
Power
P = V × I
P = I² × R
P = V² / R
P = I² × R
P = V² / R