Ohms Law Wheel
Enter any two of voltage, current, resistance or power — the wheel computes the other two live.
The two quadrants you fill light up. Cover a letter to see its formulas below.
Enter any two values.
All 12 formulas
V = I × R
V = P ÷ I
V = √(P × R)
I = V ÷ R
I = P ÷ V
I = √(P ÷ R)
R = V ÷ I
R = P ÷ I²
R = V² ÷ P
P = V × I
P = I² × R
P = V² ÷ R
Which formula is used depends on the two values you enter. Fields that were computed show a dotted border.