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

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

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

None of these
The ac voltage lags the current by 90 degree
Resistances provide the only opposition to current flow
Combinations of resistance and inductive reactance provide any opposition to current flow
Inductive reactance provides the only opposition to current flow

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