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The hertz (symbol: Hz) is a unit of frequency. It is defined as the number of cycles per second. It is the basic unit of frequency in the International System of Units (SI), and is used worldwide in both general-purpose and scientific contexts. Hertz can be used to measure any periodic event; the most common uses for hertz are to describe radio and audio frequencies, more or less sinusoidal contexts in which case a frequency of 1 Hz is equal to one cycle per second.

Hertz are electromagnetic waves. More Hertz are generated when more number of cycles take place.

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ans #2: 50 and 60 Hz generators are synchronous machines (alternators), which means that they turn at the supply frequency. On a 50 Hz system they mostly turn at 3000 rpm or 50 rev/sec. When all the generators and loads are all connected to one grid system, they all have to run at exactly the same speed. When an alternator has an additional electrical load connected to it, the phase angle of the rotor drops back a little and the torque and power required to maintain the speed both increase.

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Q: How 50 Hz or 60 Hz are generated?
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