Question

A step-up transformer works on 220V and gives 2 A to an external resistor. The turn ratio between the primary and secondary coils is 2:25. Assuming 100% efficiency, find the secondary voltage. Primary current and power delivered.

• A. 2750 V, 25 A, 5500 W
• B. 2750 V, 20 A, 5000 W
• C. 2570 V, 25 A, 550 W
• D. 2750 V, 20 A, 55 W

Answer 1

Answer: (A)

2750 V, 25 A, 5500 W

Answer 2

$\frac{E_s}{E_p}=\frac{N_s}{N_p}=\frac{i_p}{i_s},P=E_si_s$