Question

A 400 $\Omega$ electric heater is connected to a 200 V, 50 Hz mains supply. The peak
value of electric current flowing in the circuit is approximately

• A. 2.5 amp
• B. 5.0 amp
• C. 0.7 amp
• D. 10 amp

Answer 1

The correct option is C 0.7 amp

200V is the rms value of the potential difference. So the peak value of the voltage is $200\sqrt{2}$.
Thus, peak value of current = $\frac{200\sqrt{2}}{400}=0.7amp$