16: Equations Flashcards

1
Q

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

A

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

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2
Q

Permeance =

Just for proportionality, calculations aren’t necessary

A

Permeance Λ = μA/L
where μ = permeability
A = cross-sectional area
L = Length

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3
Q

flux linkage

A

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4
Q

emf induced in a rod moving through a uniform magnetic field

A
E  =  vLB
v = velocity
L = length
B = flux density
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5
Q

units for flux density

A

Wb m^-2

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

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6
Q

power generated by moving rod cutting through lines of flux

condition for this to happen

A
P = I(vLB)
P =power
I = current
v = velocity
L = length
B = flux density
rod must be moved perpendicular to the lines of flux
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7
Q

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

A

flux = BA cos theta

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8
Q

how to calculate voltage using flux linkage

A

V (emf) = flux linkage / time

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