Question

A current of 6A is flowing at 220V in the primary coil of a transformer.If the voltage produced in the secondary coil is 1100V and 40% of power is lost then the current in the secondary coil will be:

Answer 1

Explanations & Calculations

• As 40% power is lost during the usage, the available power for the secondary or the efficiency of the transformer is 60%.
• Therefore,

$\qquad\qquad \begin{aligned} \small 220V\times 6A \times \frac{60}{100}&= \small 1100V\times i_s\\ i_s &= \small \bold{0.72A = 720mA } \end{aligned}$