PHYSICAL QUANTITY

Power: formulas and units of measurement

Power: symbol P, N, unit W. Formulas and explanations for Mechanics, Electricity.

P,\ N

P, N

\text{Vt}

watt

KEY CONNECTIONS

Formulas

P = \frac{A}{t}

P = A / t

P = F v

P = Fv

P = U I

P = UI

P = I^{2} R

P = I²R

P = \frac{U ^{2}}{R}

P = U² / R

NOTATION

$P$: Power is the speed of doing work or transferring energy.
$A$: Work is a measure of energy transferred when a force is applied.
$t$: Time is a quantity characterizing the duration and sequence of events.
$F$: Force is a measure of the interaction of bodies that changes their movement or shape.
$v$: Speed is the speed and direction of change in body position.
$U$: Electric voltage is the work done by the electric field when transferring a unit charge.
$I$: 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.

THEORY

PRACTICE