Electronic Principles
Current is

The number of free electrons in an atom
An imbalance of electrical charges
The flow of charged particles through a material
The force that causes electrons to flow
None of these

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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
Inductive reactance provides the only opposition to current flow
Resistances provide the only opposition to current flow
Combinations of resistance and inductive reactance provide any opposition to current flow

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

A conductor allows current to flow much easier than an insulator does
None of these
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
The difference between conductors and insulators depends on how they are used

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Electronic Principles
What is a free electron?

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

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