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 same heat as produced by A.C. when flowing through the same circuit
The less heat than produced by A.C. 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 series and parallel resonance on L-C circuit' differs in that

Series resistance needs a low-resistance source for sharp rise in current
Parallel resonance needs a low-resistance source for a sharp rise in line current
Parallel resonance needs a low-resistance source for a sharp increase in impedance
Series resonance needs a high-resistance source for sharp increase in current

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