Transformers

Question 1

What happens in a step down transformer?

Answer 1

Less turns (and less pd) in secondary coil

Question 2

What is the structure of a transformer?

Answer 2

Primary coil, secondary coil and soft iron core

Question 3

What are the stages of a transformer?

Answer 3

1) Alternating current in PC
2) Alternating magnetic field in iron core
3) Magnetic field cut by secondary coil (EM induction)
4) AC in secondary coil

Question 4

What happens if a transformer is 100% efficient?

Answer 4

Power input = power output

Question 5

What are the properties of a switch mode transformer?

Answer 5

1) High frequency (50 - 200 KHz)

2) Lighter and smaller

Question 6

What do phone chargers use?

Answer 6

Switch mode transformers

Question 7

Why are switch mode transformers efficient?

Answer 7

Use little power when switched on but no load is applied

Question 8

What happens in a step up transformer?

Answer 8

More turns (and more pd) in secondary coil