AC Fundamentals, Circuit and Circuit Theory
The r.m.s. value of alternating current is given by steady (D.C.) current which when flowing through a given circuit for a given time produces

The less heat than produced by A.C. flowing through the same circuit
The same heat as produced by A.C. when flowing through the same circuit
The more heat than produced by A.C. when flowing through the same circuit
None of these

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AC Fundamentals, Circuit and Circuit Theory
The phase difference between voltage and current wave through a circuit element is given as 30°. The essential condition is that

Both waves must have identical peak values
Both waves must have zero value at the same time
Both waves must have same frequency
None of the listed here

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