PHYSICAL QUANTITY

Electromotive force: formulas and units of measurement

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

\mathcal{E}ε\text{В}volt

KEY CONNECTIONS

Formulas

\mathcal{E}=\frac{A_{\text{ст}}}{q}ε = Aст / q

I=\frac{\mathcal{E}}{R+r}I = ε / (R + r)

\mathcal{E}_i=n\frac{\left|\Delta\Phi\right|}{\Delta t}εᵢ = n|ΔΦ| / Δt

\mathcal{E}_{\text{си}}=L\frac{\left|\Delta I\right|}{\Delta t}εси = L|ΔI| / Δt

NOTATION

\mathcal{E}: Electromotive force is the work of external forces during the transfer of a unit charge.
A_{\text{ст}}: The work of external forces is the energy transferred to the charge by non-electrostatic forces.
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.
r: Internal resistance is the resistance of the electric current source.
\mathcal{E}_i: The electromotive force of induction is the action of a vortex electric field in a circuit.
n: The number of turns is the number of turns of conductor in the coil.
\Delta\Phi: Magnetic flux change is the amount of change in magnetic field flux.
\Delta t: Time interval - the duration of the process under consideration.
\mathcal{E}_{\text{си}}: The electromotive force of self-induction is the action of the field that arises when one's own current changes.
L: Inductance is the ability of a conductor to create a magnetic field when current passes.
\Delta I: Change in current strength - the amount of change in current over the time in question.

THEORY

PRACTICE