SITEMAP School-college Physics Notes: Electricity 6.6 Transformer calculations
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National Grid electricity supply: Part 6.6 Examples of transformer calculation practice questions and worked out answers
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6.6 Examples of transformer calculation practice questions and worked out answers
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ANSWERS to the transformer questions
Q1 A transformer has 200 turns on the primary coil and 10 turns on the secondary coil.
Q2 The p.d. across the primary coil of a transformer was 12000 V and the current flowing through it was 20 A.
Q3 A power station step-up transformer has 500 turns of wire on the primary coil and 8000 turns of wire on the secondary coil.
Q4 The p.d. across the primary coil of a transformer is 240 V and carries a current of 5.0 A.
Q5 A transformer has 20 turns of wire on the secondary coil and the p.d. across it is 3.0 V.
Q6 The output p.d. across the secondary coil of a transformer is 6.0 V and a current flowing through it of 0.50 A.
Q7 The secondary coil of a transformer has a p.d. output of 120 V.
Q8 The p.d. across the secondary coil of a transformer is 12.0 V and 0.30 A flows through it.
Q9 A laptop charger works off the 230 V AC mains supply.
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