Electronic Principles
A device that converts mechanical pressure to electrical energy is called a:

None of these
photodiode
piezoelectric device
nicad cell
solar cell

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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
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

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Electronic Principles
A farad is defined as the amount of capacitance necessary for:

storing 1 V for 1 second
dissipating 1 W of power
causing an ac phase shift greater than 90 degree
None of these
changing the voltage on the plates at the rate of 1 V per second when 1 A of current is flowing

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Electronic Principles
The total capacitance of a series capacitor circuit is:

equal to the sun of the individual capacitive-reactance values
less than the value of the smallest capacitor
equal to the sum of the individual capacitance values
equal to the source voltage divided by total current
None of these

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