Flux Linkage and Electromotive Force Flashcards
(10 cards)
1
Q
flux linkage definition
A
total magnetic flux linking all the turns in a coil
2
Q
flux linkage formula
A
𝜓 = N * Φ
psi = flux linkage
N = number of turn is a coil
Φ = magnetic flux through one coil
3
Q
faraday’s induction law
A
e.m.f. (voltage) induced in a circuit = rate of change of flux linkages
4
Q
electromotive force definition
A
when magnetic flux changes over time, it induces an emf (volatage) in a coil
5
Q
formula for emf
A
e = -(d𝜓/dt) = -N*(dphi/dt)
negative sign comes from Lenz’s law
6
Q
Lenz’s law
A
induced emf opposes the change in flux
7
Q
how is flow of current produced
A
when coil linked to phi is loaded
8
Q
formula for induced current (formula sheet)
A
Ia = psi / L = (N*phi) / L
where L = coil inductance
9
Q
what is flux linkage measured in
A
psi in T
10
Q
electromotive force measured in
A
e in V
