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Chapter 5. Power > Understanding and Testing Power

Understanding and Testing Power

The power for your computer is derived from electricity, which is basically the flow of electric charge. Electricity is defined and measured in several ways, most commonly:

  • Voltage, a representation of potential energy; sometimes it’s more simply referred to as pressure; its unit of measurement is volts (V).

  • Wattage or electric power, the rate of electric energy in a circuit, measured in watts (W).

  • Amperage or electric current, the movement of electric charge, measured in amperes or amps (A).

  • Impedance, the amount of resistance to electricity, measured in ohms (Ω).


  

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