Question

A step up transformer is connected to an ac mains supply of 220 V to operate at 11000 V, 88 watt. The current in the secondary circuit, ignoring the power loss in the transformer, is

• A. 8 mA
• B. 4 mA
• C. 0.4 A
• D. 4 A

Answer 1

The Correct Option is A

Assuming no power loss, the power in the primary coil equals the power in the secondary coil. The formula for power (P) is VI. Primary voltage ($V_p$) is 220 V. Secondary voltage ($V_s$) is 11000 V. Power (P) is 88 W. Calculate the secondary current ($I_s$).

88 = 11000

$\implies i = \frac{88}{11 \times 10^3} = 8 \times 10^{-3} \text{ A}$

$\implies i = 8 \text{ mA}$