PHYSICAL QUANTITY

Electromotive force: formulas and units of measurement

Electromotive force: symbol ε, unit B. Formulas and explanations for Electricity, Magnetism.

εvolt

KEY CONNECTIONS

Formulas

ε = Ast / q

I = ε / (R + r)

εᵢ = n|ΔΦ| / Δt

εsi = L|ΔI| /Δt

NOTATION

: Electromotive force is the work of external forces during the transfer of a unit charge.
: The work of external forces is the energy transferred to the charge by non-electrostatic forces.
: Electric charge is a quantity that determines the participation of a body in electrical interaction.
: 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.
: Internal resistance is the resistance of the electric current source.
: The electromotive force of induction is the action of a vortex electric field in a circuit.
: The number of turns is the number of turns of conductor in the coil.
: Magnetic flux change is the amount of change in magnetic field flux.
: Time interval - the duration of the process under consideration.
: The electromotive force of self-induction is the action of the field that arises when one's own current changes.
: Inductance is the ability of a conductor to create a magnetic field when current passes.
: Change in current strength - the amount of change in current over the time in question.

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.