Question

An electric appliance draws 3A current from a 200 V, 50 Hz power supply. The amplitude of the supply voltage is nearly:

• A. 140 V
• B. 200 V
• C. 283 V
• D. 67 V
• E. 600 V

Hint:

Remember, for sinusoidal voltages, \( V_{{peak}} = V_{{RMS}} \times \sqrt{2} \) because RMS voltage is the effective value that represents the DC equivalent voltage.

Answer 1

The Correct Option is C

The RMS (root mean square) voltage of the power supply is 200 V. The amplitude (peak voltage) of a sinusoidal supply is given by \( V_{{peak}} = V_{{RMS}} \sqrt{2} \): \[ V_{{peak}} = 200 \times \sqrt{2} \approx 283 { V} \]