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It's difficult to figure out exactly what your question is referring to...so I'll cover as many bases as I can.In the United States, the Electrical grid is delivered to consumers in the form of AC 110 - 125 volts, and runs at 60 Hz (cycles per second). Compare this to Europe which runs at 220 volts at 50 Hz. The actual voltage will very from time to time depending on customer demand, utility supply, and a number of other factors which are essentially out of our control. however, the 60 Hz SHOULD stay the same all the time.Inside the computer, the power supply uses a transformer to exchange voltage for amperes, reducing the voltage to about 12 volts, converts the AC to DC with a rectifier bridge, and store the resulting DC into a capacitor to smooth the flow out a bit. the power supply then breaks the power up into 12V, 5V, -5V, and -12V. If the motherboard in the computer needs other voltages (3.3v, 1.7v, etc), then the motherboard must reduce the voltage further itself).I hope this is what you needed.

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