Transformers

Question 1

A transformer allows you to

Answer 1

Convert from one voltage to another

Allows the passing of AC while blocking DC

Question 2

Turn ratio formula - transformers

Answer 2

Vs/Vp = Ns/Np

Question 3

How does a step up transformer work

Answer 3

Increases the voltage by increasing the amount of coils around the soft iron core

Question 4

Step up transformer has more turns

Answer 4

On the secondary than the primary

Step down - more on the primary than the secondary

Question 5

Auto transformer

Answer 5

Different points you can pick of the required voltage

E.g desk fan buttons for variable speed

Question 6

Variable transformer

Answer 6

Dial to control voltage

E.g electric train set speed controller

Question 7

Current transformer (ring transformer)

Answer 7

Allows you to measure the amps with a little amount of weight - less packaging

Hoop with coils around it, wire with the current through the centre

Question 8

Transformer rectifier unit

Answer 8

Transformer and a rectifier at the same time

Converts AC to DC

Cooling fan for when the battery is charged - energy is dissipated as heat

Question 9

Rotary inverter

Answer 9

DC motor rotating on a AC generator

Magnet spins in an AC generator