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NCERT Class XII Chapter
Alternating Current
Questions With Solutions

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Question : 2
Total: 26
(a) The peak voltage of an a.c. supply is 300 V. What is the rms voltage?
(b) The rms value of current in an a.c. circuit is 10 A. What is the peak current?
Solution:  
(a) The peak value of a.c. supply is given 300 V.
E0 = 300 V. So, rms value of voltage,
Ev =
E0
√2
 =
300
√2
 = 150 √2 V = 212.1 V
(b) Here Iv = 10 A
Thus, peak current I0 = Iv√2 = 10 √2 A = 14.1 A
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