Transformers Flashcards

1
Q

A transformer allows you to

A

Convert from one voltage to another

Allows the passing of AC while blocking DC

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2
Q

Turn ratio formula - transformers

A

Vs/Vp = Ns/Np

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3
Q

How does a step up transformer work

A

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

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4
Q

Step up transformer has more turns

A

On the secondary than the primary

Step down - more on the primary than the secondary

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5
Q

Auto transformer

A

Different points you can pick of the required voltage

E.g desk fan buttons for variable speed

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6
Q

Variable transformer

A

Dial to control voltage

E.g electric train set speed controller

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7
Q

Current transformer (ring transformer)

A

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

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8
Q

Transformer rectifier unit

A

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

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9
Q

Rotary inverter

A

DC motor rotating on a AC generator

Magnet spins in an AC generator

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