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

None of these
solar cell
chemical cell
thermocouple
piezoelectric devices

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Electronic Principles
Which one of the following phrases most accurately describes a purely capacitive circuit?

Resistances provide the only opposition to current flow
Combinations of resistance and capacitive reactance provide any opposition to current flow
None of these
The ac voltage leads the current by 90 degree
Capacitive reactance provides the only opposition to current flow

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Electronic Principles
What is the primary difference between primary and secondary cell batteries?

Secondary-cell batteries can be recharged and used many times, whereas primary-cell batteries cannot be properly recharged
Primary-cell batteries must be recharged at a much slower rate that secondary-cell batteries
Primary-cell batteries use chemical cells, whereas secondary-cell batteries use an alternative energy source, such as thermal or magnetic energy, to supplement their outputs
Primary-cell batteries can be recharged and used many times, whereas secondary-cell batteries cannot be properly recharged
None of these

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Electronic Principles
Waveforms are graphs that show:

amplitude on the vertical axis and the passage of time on the horizontal axis
amplitude on the vertical axis and frequency on the horizontal axis
frequency on the vertical axis and amplitude on the horizontal axis
None of these
the passage of time on the vertical axis and amplitude on the horizontal axis

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