Transformers

Question 1

What do transformers do

Answer 1

Change the side of the pd and alternating current

Question 2

What is a transformer made up of

Answer 2

-primary coil
-secondary coil
-iron core

Question 3

How do transformers work

-when an a… pd is passed through the p… coil the iron c… magnetises and d… quickly
-the changing m… field induces an a… pd in the s… coil
-if it is a c… circus then a c… flows

Answer 3

-when an alternating pd is passed through the primary coil the iron core magnetises and demagnetises quickly
-the changing magnetic field induces an alternating pd in the secondary coil
-if it is a complete circus then a current flows

Question 4

Equation to calculate the output pd of a transformer

Answer 4

Vp = Np
Vs = Ns

Vp= input pd
Vs= outfit pd
Np= no. Turns in primary coil
Ns= no. Turns in secondary coil

Question 5

How efficient are transformers

Answer 5

Almost 100%

Question 6

Equation for transformers

Answer 6

Vs x Is = Vp x Ip

Vs= pd across secondary coil
Is= current through secondary coil
Vp= pd across primary coil
Ip= pd across primary coil

Question 7

2 types of transformers

Answer 7

Step-up and step-down

Question 8

What do step-up transformers do

Answer 8

-increase pd
-decrease current
-they have more turns on secondary coil that primary

Question 9

What do step-down transformers do

Answer 9

-decrease pd
-increase current
-more turns on primary coil than secondary