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

An insulator allows current to flow much easier than a conductor does
A conductor allows current to flow much easier than an insulator does
The difference between conductors and insulators depends on how they are used
None of these
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
A low-pass filter:

has no effect on ac signals
None of these
reduces the level of all frequencies by a significant amount
passes lower-frequency signals and reduces higher-frequency signals
passes higher-frequency signals and reduces lower-frequency signals

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Electronic Principles
Which one of the following statements is true for resistance in a parallel circuit?

The total resistance of a parallel circuit is equal to the total voltage
The total resistance of a parallel circuit is always less than the value of the smallest resistance
The total resistance in a parallel circuit is equal to the average value of the individual resistances
The total resistance is equal to the sum of the individual resistances in a parallel circuit.
None of these

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