PHYSICAL QUANTITY

Power: formulas and units of measurement

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

P, Nwatt

KEY CONNECTIONS

Formulas

P = A / t

P = Fv

P = UI

P = I²R

P = U² / R

NOTATION

: Power is the speed of doing work or transferring energy.
: Work is a measure of energy transferred when a force is applied.
: Time is a quantity characterizing the duration and sequence of events.
: Force is a measure of the interaction of bodies that changes their movement or shape.
: Speed is the speed and direction of change in body position.
: Electric voltage is the work done by the electric field when transferring a unit charge.
: Current strength is the charge passing through the cross section of a conductor per unit time.
: Electrical resistance is a measure of a conductor's resistance to electric current.

THEORY

PRACTICE

Topics in order: the concepts, quantities and formulas of a lesson with explanations and examples.

Statements, answer options and a detailed walkthrough for every topic of the course.

A 10-question check-up, exercises with answer checking, and saved progress.