Electronic Principles
Current and voltage are said to be in phase when:

they have the same amplitude and frequency
their waveforms cross through zero and reach positive and negative peaks at the same time
All of these
their waveforms are both ac or both dc
None of these

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Electronic Principles
Voltage is

Trie force that causes electrons to flow
The number of free electrons in an atom
The smallest electrically charged particle
None of these
The flow of charged particles through a material

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Electronic Principles
The total impedance of a parallel RLC circuit:

is maximum at the resonant frequency
always decreases as the applied frequency increases
is equal to the sum of the values of resistance, inductive reactance and capacitive reactance
None of these
always increases as the applied frequency increases

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