Electronic Principles
What form of energy is used to maintain an imbalance of charges between the terminals of a battery?

Electronical energy
Solar energy
Chemical energy
Mechanical energy
None of these

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Electronic Principles
For a pure capacitor:

ac current lags the voltage by 90 degree
ac current and voltage are exactly in phase
None of these
ac current is converted to dc voltage
ac current leads the voltage by 90 degree

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Electronic Principles
The total impedance of a parallel RLC circuit:

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

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