Electronic Principles
Which one of the following equations most directly determines the power dissipation of a resistance when you know the voltage drop and amount of resistance?

None of these
P = E2/R
P = IE
I = P/E
P = I2R

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Electronic Principles
Which one of the following statements most accurately describes the nature of inductive reactance?

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

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

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

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