Electric Circuits Voltage Drop
Calculate voltage drop in electric circuits using Ohm's law and other methods. Voltage drop is calculated using resistance and current, or by using specific resistivity with wire properties, or by using conductor factors.
Voltage Drop Calculator
Voltage drop in an electric circuit can be calculated using Ohm's law:
U = R × I
where:
- U = voltage drop (volts, V)
- R = electrical resistance (ohms, Ω)
- I = current (amps, A)
Alternatively, using wire properties:
U = K × P × L × I / A
where:
- K = specific resistivity (Ω - circular mils/foot)
- P = phase constant (2 for single phase, 1.732 for three phase)
- L = wire length (ft)
- A = wire area (circular mils)
Or using conductor factor:
U = f × I × L
where:
- f = factor from lookup table
- I = current (amps)
- L = conductor length (ft)