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

solar cell
nicad cell
photodiode
piezoelectric device
None of these

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Electronic Principles
The period of a waveform is:

equal to 0.707 times the peak amplitude
the time required to complete one full cycle
the time required for the voltage to rise from 10% to 90% of the peak amplitude
the number of cycles completed in one second
None of these

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Electronic Principles
Which one of the following is a direct statement of Ohm's law?

The algebraic sum of voltages in a loop is equal to zero
The voltage drop across a resistance is proportional to the value of resistance and the amount of current flowing through it
The algebraic sum of currents entering and leaving a point is equal to zero
The total resistance of a parallel circuit is less than the value of the smallest resistance
None of these

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