# Electric Voltage

Written by Jerry Ratzlaff on . Posted in Electrical Engineering

Volt $$(V)$$ or $$(E)$$ is a unit of electrical pressure.  One volt is the amount of pressure that will cause one ampere of current in one ohm of resistance.  Different voltages that are typically used in the oilfield in the USA are 480V, 4,160V and 12kV (Kilo Volt).

## Voltage formula

$$\large{ V = I \; R }$$

$$\large{ V = \frac{P}{I} }$$

$$\large{ V = \sqrt{P \; R} }$$

Symbol English Metric
$$\large{ V }$$ = volt $$\large{V}$$ $$\large{\frac{kg-m^2}{s^3-A}}$$
$$\large{ I }$$ = current $$\large{I}$$ $$\large{\frac{C}{s}}$$
$$\large{ P }$$ = power $$\large{P}$$ $$\large{\frac{kg-m^2}{s^3}}$$
$$\large{ R }$$ = resistance $$\large{\Omega}$$ $$\large{\frac{kg-m^2}{s^3-A^2}}$$