Question

The primary of a transformer has 400 turns while the secondary has 2000 turns. If the power output from the secondary at 1000 Vis 12 kW, what is the primary voltage?

Options

• 200 V

• 300 V

• 400 V

• 500 V

Answer 1

200 V

Explanation:

N_P = 400, N_s = 2000 and V_s = 1000 V. 

`"V"_"P"/"V"_"S" ="N"_"P"/"N"_"S"` of,

V_P = `("V"_"S"xx"N"_"P")/"N"_"S"`

= `(1000xx400)/2000`

= 200 V.