Question

The figure shows variation of current (I) with time (t) in four devices P, Q, R and S. The device in which an alternating current flows is :

An alternating current I = 14 sin (100 πt) A passes through a series combination of a resistor of 30 Ω and an inductor of (2/5π) H. Taking √2 = 1.4, calculate the (i) rms value of the voltage drops across the resistor and the inductor, and (ii) power factor of the circuit.