# Voltage Coefficient of Resistance

Written by Jerry Ratzlaff on . Posted in Electrical Engineering

Voltage coefficient of resistance, abbreviated as VC, is the change in resistance with applied voltage.

## Voltage Coefficient of Resistance formula

 $$\large{ VCR = \frac { 100 \; \left( R_1 \;-\; R_2 \right) }{ R_2 \; \left( V_1 \;-\; V_2 \right) } }$$

### Where:

 Units English Metric $$\large{ VCR }$$ = voltage coefficient of resistance $$\large{\frac{V}{I}}$$ $$\large{\Omega}$$ $$\large{ R_1 }$$ = resistance at the rated voltage $$V_1$$ $$\large{\frac{V}{I}}$$ $$\large{\Omega}$$ $$\large{ R_2 }$$ = resistance at 10% of rated voltage $$V_2$$ $$\large{\frac{V}{I}}$$ $$\large{\Omega}$$