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NCERT Class XII Chapter
Alternating Current
Questions With Solutions

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Question : 1
Total: 26
A 100 Ω resistor is connected to a 220 V, 50 Hz a.c. supply.
(a) What is the rms value of current in the circuit?
(b) What is the net power consumed over a full cycle?
Solution:  
(a) Here virtual a.c. voltage is 220 V at a frequency of 50 Hz.
So, rms value of current

Iv =
Ev
R
 =
220
100
 = 2.2 A
(b) Power in complete cycle
P = EvIccosΦ = EvIv cos 0° or P = 2.2 × 220 = 484 W
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