Question

In a transformer $N_p$ = 500, $N_s$ = 5000. Input voltage is 20 V and frequency is 50 Hz. What are the output voltage and frequency ?

• A. 200V, 40Hz
• B. 400V, 50Hz
• C. 200V, 0Hz
• D. 150V, 40Hz

Answer 1

Answer: (C)

200V, 0Hz

Answer 2

Using $\frac{E_s}{E_p} = \frac{N_s}{N_p} : E_s = \frac{N_s}{N_p} \times E_p$ Putting the given values $E_s = \frac{5000}{500} \times 20$ = 200 V Frequency in a transformer remains the same so the output frequency is 50 Hz.