AC and Transformers

Question 1

What is Vpp?

Answer 1

Peak to peak Voltage

Question 2

What is V0?

Answer 2

Peak Voltage

Question 3

How do you convert between Vpp and Vo?

Answer 3

2V0 = Vpp

Question 4

What is Rms?

Answer 4

Root mean square average

Question 5

How is Rms Calculated?

Answer 5

Square the data set
Take a mean average
Root the mean average

Question 6

How do you convert between V0 and Vrms?

And Irms and I0

Answer 6

Vrms = V0/2^0.5
Irms = I0/2^0.5

Question 7

What must you do with Rms and peak values in equations?

Answer 7

Have them in the smae type

Eg only Rms in an equation or only peak vlaues

Question 8

What is the Transformer Equation?

Answer 8

Ns/Np = Vs/Vp
Ns = Number of turns on secondary coil
Np = Number of turns on primary coil
Vs = pd in secondary coil
Vp = pd in primary coli

Question 9

What equation is the effieciency of a ‘transformer?

Answer 9

effieciency = IsVs/IpVp
Is = Current in secondary coil
Vs = pd in secondary coil
Ip = current in primary coil
Vp = pd in primary coil

Question 10

How does an AC transformer work in terms of Flux linkage?

Answer 10

An alternating current in the primary coil produces an alternating flux.
The alternaing flux passes through the soft iron core to the secondary coil.
An EMF is induced in the secondary coil due to the changing flux.

Question 11

Methods to reduce energy loss in the Transformer?

Answer 11

Use a soft iron core to reduce hysterisis.
Use a alaminated iron core to reduce eddy currents
Use wires with a low resistivity or high cross-sectional area to reduce heat loss from resistance.
Use a high quality iron core to reduce impurities and air gaps in the iron.