# 16: Equations Flashcards

Relationship of Current, Voltage and No. of coils in a primary and secondary coil

what is the ratio called

what does the minus sign signify

V₁ / V₂ = -N₁ / N₂ = -I₂ / I₁

Current is different!!!

1 = primary

2 = secondary

N1 / N2 = the turns ratio, number of turns in primary / number of turns in secondary

the alternating pd in the second coil is 180 degrees out of phase with the alternating pd across the primary coil

Permeance =

Just for proportionality, calculations aren’t necessary

Permeance Λ = μA/L

where μ = permeability

A = cross-sectional area

L = Length

flux linkage

NΦ

emf induced in a rod moving through a uniform magnetic field

E = vLB v = velocity L = length B = flux density

units for flux density

Wb m^-2

(1 T tesla) = N A^-1 m^-1

power generated by moving rod cutting through lines of flux

condition for this to happen

P = I(vLB) P =power I = current v = velocity L = length B = flux density rod must be moved perpendicular to the lines of flux

equation to calc flux when its at an angle not 90 degrees

flux = BA cos theta

how to calculate voltage using flux linkage

V (emf) = flux linkage / time