Electronic Principles
At room temperature an intrinsic silicon crystal acts approximately like

a battery
None of these
a conductor
an insulator
a piece of copper wire

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Electronic Principles
The south pole of a magnet is the one:

that would be attracted to the earths north magnetic pole
that would be repelled by the north pole of another magnet
that has its molecules arranged in a random pattern
that would be attracted to the earth's south magnetic pole
None of these

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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 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
Primary-cell batteries must be recharged at a much slower rate that secondary-cell batteries
None of these

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