Question

What is the rms value of the current, if its instantaneous current value is 8 sin314 t?

(a) 2√4 A

(b) 10 A

(c) 4√2 A

(d) 50 A

This question was addressed to me in an interview.

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

Answer 1

Correct option is (c) 4√2 A

For explanation: I = I0 sinωt.

Irms = \(\frac {I_0}{\sqrt {2}}\)

Irms = \(\frac {8}{(\sqrt {2})}\)

Irms = 4√2 A