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

Mechanical energy
Chemical energy
Solar energy
Electronical energy
None of these

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Electronic Principles
For a pure capacitor:

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

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Electronic Principles
What is a free electron?

An electron that has twice the amount of charge of a normal electron
An electron that has no electrical charge
An electron that has been freed from its parent atom
None of these
An electron that costs nothing

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