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A transformer has an efficiency of . It is connected to a power input of at . If the secondary voltage is , the primary and secondary currents are respectively
(a)
(b)
(c)
(d)

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Important Questions on Alternating Current
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For the given circuit, comment on the type of transformer used :

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A power transmission line feeds input power at to a step down transformer with its primary windings having turns. What should be the number of turns in the secondary in order to get output power at ?

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An ideal transformer has and turn in primary and secondary windings, respectively. If the primary voltage is connected to a DC battery, then the secondary voltage is:

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