Transformers

Question 1

Left Hand Motor Rule?

Answer 1

Thumb = Motion
First Finger = Field
Second Finger = Current

Question 2

Right Hand Generator Rule?

Answer 2

Thumb = Motion
First Finger = Field
Second Finger = EMF

Question 3

Faraday’s Law?

Answer 3

e = N*Dphi/Dt

Measured in Volts

Question 4

Lenz’s Law?

Answer 4

e = Blv

Measured in Volts

Question 5

Relationship between two emfs for ideal transformer?

Answer 5

E1/N1 = E2/N2

N1I1 = N2I2

Question 6

Non-ideal transformer, what is the power loss formula?

Answer 6

Iron losses (eddy and hysteresis losses) - The windings of the transformer have some resistance, known as copper losses.

Ploss = I^2*R

Question 7

What is the efficiency formula?

Answer 7

n = Pout/ Pout+Ploss

n = Pout/ Pin