The ratio of peak value and r.m.s value of an alternating current is
(a) 1
(b) 
(c) √2
(d) 1/√2
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answer : option (d) 
explanation : we know an important formula

where
denotes root mean square value of alternating current.
denotes peak value of alternating current.
now,
or,
hence, The ratio of peak value and r.m.s value of an alternating current is 1/√2
explanation : we know an important formula
where
now,
or,
hence, The ratio of peak value and r.m.s value of an alternating current is 1/√2
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