Problem

In a transformer, the output current and voltage are respectively

4 \text{ A}

and

20 \text{ V}

. If the ratio of number of turns in the primary to secondary is

2 : 1

, what is the input current and voltage? (a)

2 \text{ A}

and

40 \text{ V}

(b)

8 \text{ A}

and

10 \text{ V}

(c)

4 \text{ A}

and

10 \text{ V}

(d)

8 \text{ A}

and

40 \text{ V}