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Frequency of what?

Different sound frequencies give us music. The world would be a duller place without it.

Different radio frequencies, allow is to be selective in tuning and enable many different wireless connections to be made, without interference.

Different frequnecies of light give us colors. Again the world would be a far duller place without color.

Ans. 2

Frequency, measured in Hertz, in alternating currents, is a measure of the speed of cyclic change in the flow of electricity. AC Electricity in the US is generated at 60 cycles per second (Europe is 50 Hertz). Generators in order to connect to an electrical grid must match frequency with the grid before closing the field switch. Equipment using electricity is designed to operate at 60Hz in the US. Electric motors connected to the grid will spin at a fraction of the cyclic speed (example: 600 rpm, 1800 rpm or 3600 rpm) .

note: Variable speed motors run power through rectifiers to vary the frequency thus changing their speeds throughout a wide spectrum. DC electric motors have independent power sources and can run at variable speeds because there is no alternating current cycle.

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Karen Luettgen

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3y ago

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