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

None of these
photodiode
solar cell
piezoelectric device
nicad cell

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Electronic Principles
What is a free electron?

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

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

The total voltage leads the total current by less than 90 degree
None of these
The total voltage is equal to the sum of the voltages across the resistance and capacitance
The voltage always has the same amplitude and phase for every part of the circuit
The total voltage is less than the sum of the voltages across the resistance and capacitance

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