\[V_d=IR\]
Variables
Vdvoltage drop (V)
Icurrent (A)
Rconductor resistance (Ω)
Description
What is this formula?
The voltage drop equation calculates the reduction in voltage that occurs along a conductor due to its electrical resistance and the current flowing through it.
When to use it
Use this formula when sizing conductors, evaluating feeder performance, checking voltage regulation, and designing electrical distribution systems.
Example
A feeder carries:
Current = 50 A
Resistance = 0.12 Ω
Formula:
Vd = IR
Substitution:
Vd = 50 × 0.12
Result:
Vd = 6 V
Applications
Electrical distribution systems
Cable sizing
Voltage regulation studies
Industrial power systems
Building electrical design