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

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

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Electronic Principles
The period of a waveform is:

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

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

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

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