Electronic Principles
Current is

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

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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 statements most accurately describes the nature of inductive reactance?

Inductive reactance is another term for counter emf
None of these
Inductive reactance is an opposition to current flow in ac circuits
Inductive reactance is an opposition to current flow in dc circuits
Inductive reactance is a force that tends to overcome the effects of counter emf

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