Pearson Edexcel International GCSE (9–1) · PHYSICS · Chapter
Electromagnetic Induction
61 practice questions
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Question 61
4 marks · Normal
Answer and see the solution →A power station supplies 20,000 V a.c. at a current of 800 A to a step-up transformer which is 100% efficient. The transformer increases the voltage for long-distance transmission. A second transformer later steps the voltage down to 5,000 V for use in a factory.
(a)[2 marks]Calculate the output current from the step-up transformer if the transmission voltage is increased to 100,000 V.
(b)[2 marks]Calculate the current supplied to the factory after the voltage is stepped down to 5,000 V, assuming 100% efficiency throughout.