Electronic Principles
At room temperature an intrinsic semiconductor has

many free electrons
None of these
a few free electrons and holes
many holes
No holes

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Electronic Principles
For a pure capacitor:

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

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Electronic Principles
Which one of the following statements most accurately reflects the nature of ac power?

The current in an ac circuit changes direction periodically
None of these
The current in an ac circuit flows in two directions at the same time
The current in an ac circuit flows in one direction, but changes value periodically
The current in an ac circuit flows in one direction at a steady level

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