Transformers and the national grid extra GCSE questions
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Practice questions
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A transformer needs
Vp / Vs =
A step-up transformer has
If Np = 200, Ns = 800, Vp = 12 V, Vs =
Common mistakes
- Transformers need a.c. (or at least a changing current). Do not write that they "slow down the electrons to reduce current" as the operating principle.
- Do not swap p and s. Do not use F = BIL here. Turns ratio is not the same as current ratio until you use power.
- Current is not "conserved". Voltage ratio is the inverse of current ratio for an ideal transformer.
- High voltage is not chosen "to make electricity faster". Current is not zero in the cables. 230 V is not safe to touch.
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