
SJE Electrical
Installations


Volt Drop & Cable Size Calculator
Ohm's law states that the current through a conductor between
two points is directly proportional to the potential difference across the
two points. Introducing the constant of proportionality, the resistance, one
arrives at the mathematical equation that describes this relationship.
V = I x R (Voltage = Current multiplied by Resistance)
R = V / I (Resistance = Voltage divided by Current)
I = V / R (Current = Voltage Divided by Resistance)
Knowing any two of the values of a circuit, one can calculate the third,
using Ohm's Law.

