Transformers

Question 1

What is the word equation used in transformers

Answer 1

secondary e.m.f/primary e.m.f = turns in secondary/turns in primary

Question 2

What is the symbol equation used in transformers

Answer 2

Vs/Vp = Ns/Np

Question 3

RECAP - The aim is to reduce current in the national grid
If we reduce current what happens to voltage and why

Answer 3

Voltage steps up since P = IV

Question 4

What type of current do transformers need for induction to occur

Answer 4

changing magnetic field so AC

Question 5

On a step up transformer which side will have more coils

Answer 5

The side going to the pylons e.g secondary coil > primary coil

Question 6

On a step down transformer which side will have more coils

Answer 6

The side leaving the pylons e.g primary coil > secondary coil

Question 7

What current is needed to enter the transformer

Answer 7

Alternating current

Question 8

What happens once alternating current enters transformer

Answer 8

creates magnetic field on primary coil which is alternating

Question 9

Once magnetic field on the primary coil what happens to the iron core

Answer 9

becomes magnetic since it is induced and is also alternating

Question 10

What does the iron core cause on secondary coil

Answer 10

since it is a full circuit is induces voltage on secondary

Question 11

What is important to prevent electricity flowing on coils

Answer 11

Insulation wrapped around coils