One hertz is one cycle per second. When generating AC power, the generator winding actually spins to create a magnetic field, and thus, electricity. One cycle is defined as the time it takes for voltage to start at zero, reach maximum positive, return to zero, reach maximum negative, and return to zero again. The U.S. power system operates at 60Hz, and many other countries operate at 50Hz. ----
If you do not understand the work well enough to accomplish it yourself properly and safely, don't try it. Consult a professional electrician, as they are proficient enough to do it properly and safely. When working on electrical circuits and equipment, make sure to de-energize the circuit you will be working on. Then test the circuit with a definitive means to make sure it is off (multimeter with metal tipped leads, voltage tester with metal tipped leads, etc., not a non-contact tester, which is non-definitive.)
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