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

piezoelectric device
photodiode
None of these
nicad cell
solar cell

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Electronic Principles
Which one of the following phrasers best describes flux density?

The rate of change of the number of lines of magnetic force
None of these
The concentration of lines of magnetic force
The opposition to a build-up of magnetic fields
The force that maintains lines of force

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

The total voltage is greater than 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
None of these
The total voltage is equal to the sum of the voltages across the resistance and capacitance

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Electronic Principles
For a pure capacitor:

ac current lags the voltage by 90 degree
ac current leads the voltage by 90 degree
ac current is converted to dc voltage
ac current and voltage are exactly in phase
None of these

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