# Voltage

Voltage is the difference in electric potential between two points. The symbol for voltage is V or U and it is measured in volts (V), which is defined as joule per coulomb.

### Ohm's law

*Ohm's law*

Ohm's law describes the relation between Voltage, Current and Resistance. The law states that the voltage is equal to the current multiplied by the resistance. Ohm's law is named after the German physicist Georg Ohm.

#### Formulas

V is the symbol for voltage and is measured in volt (V).

I is the symbol for current and is measured in ampere (A).

R is the symbol for resistance and is measured in ohm (Ω).

### Voltage drop

*Voltage drop*

The voltage drop is the voltage that is lost in a wire due to its resistance. The voltage drop is calculated with the following formula:

### RMS voltage

*RMS voltage*

The RMS voltage can be calculated with one of the following formulas:

V _{RMS } is the symbol for RMS voltage and is measured in volt (V).

V _{pk } is the symbol for peak voltage and is measured in volt (V).

V _{pp } is the symbol for peak-to-peak voltage and is measured in volt (V).

V _{avg } is the symbol for average voltage and is measured in volt (V).