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Transformers
revsion questions for GCSE physics
14
Physics
10th Grade
04/28/2008

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Cards

Term
What are the two types of transformer?
Definition
step-up
step-down
Term
what type of current passes through a transformer?
Definition
alternating current (a.c)
Term
what is the core of a transformer made of?
Definition
iron
Term

Which type of transformer makes the potential difference greater?

Definition

a step-up transformer

Term
how can you increase the potential difference?
Definition
adding more coils/ larger current
Term
why is alternating current needed?
Definition
to act as a moving magnet
Term
which type of transformer makes the current bigger?
Definition
a step-down transformer
Term
what is the equation that relates the potential difference to the number of coils?
Definition

  voltage across primary coil   # of primary coils  

voltage across secondary coil     #of secondary coils

Term
why is an insulated wire used in the coils as opposed to an uninsulated wire?
Definition
safety
Term
Which type of transformer is used between a power station and the national grid?
Definition
Step up
Term
Why is a step up transformer used before the grid?
Definition
to lower the current to prevent the wire heating up and melting/wasting power
Term
what type of transformer is used between the grid and homes?
Definition
step down trasnformer
Term
how can you tell is a transofrmer is step-up by looking at it?
Definition
a step-up transformer will have more secondary coils than primary
Term
how can you tell if a transformer is step down?
Definition
it has more primary coils than secondary
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