6 The output of an a.c. generator in a power station is 5000 V .
A transformer increases the voltage to 115000 V before the electrical power is transmitted to a distant town.
(a) State and explain, using a relevant equation, one advantage of transmitting electrical power at a high voltage.
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A
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(b) The transformer contains two coils, the primary coil and the secondary coil.
(i) State the other main component of a transformer and the material from which it is made.
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[1]
(ii) State the component in the transformer to which the a.c. generator is connected.
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[1]
(iii) There are 400 turns on the primary coil of the transformer.
Calculate the number of turns on the secondary coil.
number of turns =
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[2]