Current that changes polarity many times per second is called __________.
Answer(s): C
Current that changes polarity many times per second is called alternating current.
The measurement "mil" refers to __________.
Answer(s): B
A "mil" (from milli) refers to one thousandth.
A filter is used in a power supply to __________.
A filter is placed in the power supply to even out any voltage variations. In some cases, a choke may be used in the filter to smooth out the current variations.
Which of the following contains an electromagnet?
Of the items listed, only a doorbell contains an electromagnet.
Radio frequency amplifiers are used in __________.
Answer(s): D
Radio frequency amplifiers are used in receivers and transmitters to amplify frequencies above the range of sounds audible to humans.
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