Transformers

Question 1

What happens if an electrical conducted cuts through a magnetic field

Answer 1

A potential different is induced across the ends of a conductor

Question 2

If a magnet is turned to a coil of wire, what happens to the voltage

Answer 2

It is induced across the ends of the coil

Question 3

What does an alternating current in the primary coil produce

Answer 3

A changing magnetic field in the iron core, hence in the secondary coil

Question 4

What does an alternating current produce in a transformer

Answer 4

Alternating potential different across the ends of the secondary coil

Question 5

What happens in a step up transformer

Answer 5

The pd across the secondary coil is less that primary

Question 6

What happens to the electrical power output if transformers were 100% effective

Answer 6

Equals the electrical power input

Question 7

What high frequency is a switch mode transformer

Answer 7

50 KHz and 100 KHz

Question 8

What are the properties of a switch mode transformer compared to traditional transformers

Answer 8

Lighter

Smaller

Question 9

How much power does a switch mode transformer use

Answer 9

Very little but not load is applied