Transformers

Question 1

What do transformers do

Answer 1

change the size of the potential difference of an alternating current

Question 2

What do transformers look like

Answer 2

have two coils of wire, the primary and secondary, joined with an iron coil

Question 3

What happens when an alternating pd is applied across the primary coil

Answer 3

the iron core magnetises and demagnetises quickly. This changing magnetic field induces an alternating pd in the secondary coil

Question 4

What happens if the second coil is part is part of a complete circuit

Answer 4

it causes a current to be induced

Question 5

What is the ratio between the primary and secondary pd

Answer 5

its the same as the number of turns on the primary and secondary coils

Question 6

What are step up transformers

Answer 6

step up the potential difference up ( increase it), they have more turns on the secondary coil than the primary coil

Question 7

what are step down transformers

Answer 7

step the potential difference down ( decrease it), they have more turns on the primary coil than the secondary

Question 8

what is the transformer equation

Answer 8

input pd/ output pd = number of primary coils/ number of secondary coils