Question

Determine the rms value of current in the circuit if a 50 Ω resistor is connected across an ac source of 200 V, 50 Hz?

(a) 4 A

(b) 200 A

(c) 50 A

(d) 1 A

I had been asked this question by my school teacher while I was bunking the class.

My query is from AC Voltage Applied to a Resistor in section Alternating Current of Physics – Class 12

Answer 1

Right choice is (a) 4 A

Explanation: Irms = \(\frac {E_{rms}}{R}\)

Irms = \(\frac {200}{50}\)

Irms = 4 A