AC Fundamentals, Circuit and Circuit Theory
The frequency of an alternating current is

The number of cycles generated in one minute
The number of electrons passing through a point in one second
The number of waves passing through a point in one second
The speed with which the alternator runs

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AC Fundamentals, Circuit and Circuit Theory
The series and parallel resonance on L-C circuit' differs in that

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

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

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