Electronic Principles
What is the difference between a conductor and an insulator?

The difference between conductors and insulators depends on how they are used
None of these
A conductor allows current to flow much easier than an insulator does
An insulator allows current to flow much easier than a conductor does
An insulator has an excessive number of free electrons, while a conductor has a few free electrons or none at all

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Electronic Principles
Which one of the following phrases most accurately describes a purely capacitive circuit?

The ac voltage leads the current by 90 degree
Combinations of resistance and capacitive reactance provide any opposition to current flow
None of these
Resistances provide the only opposition to current flow
Capacitive reactance provides the only opposition to current flow

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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 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 changes direction periodically
The current in an ac circuit flows in one direction at a steady level
None of these

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