PHYSICAL QUANTITY

Electrical voltage: formulas and units of measurement

Electrical voltage: symbol U, unit B. Formulas and explanations for Electricity.

U

\text{V}

volt

KEY CONNECTIONS

Formulas

U = \frac{A}{q}

U = A / q

U = I R

U = IR

E = U + I r

ε = U + Ir

NOTATION

$U$: Electric voltage is the work done by the electric field when transferring a unit charge.
$A$: Work is a measure of energy transferred when a force is applied.
$q$: Electric charge is a quantity that determines the participation of a body in electrical interaction.
$I$: Current strength is the charge passing through the cross section of a conductor per unit time.
$R$: Electrical resistance is a measure of a conductor's resistance to electric current.
$\mathcal{E}$: Electromotive force is the work of external forces during the transfer of a unit charge.
$r$: Internal resistance is the resistance of the electric current source.

THEORY

PRACTICE