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Understanding Electricity
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Electricity is simply a flow of negatively charged particles, called electrons, through matter All matter enables the flow of electrons to some extent This flow of electrons is very similar to the flow of water through pipes; so similar that the best way to learn about electricity is by comparing it to how water flows through pipes! So let s talk about water for a moment Water comes from the ground, through wells, aquifers, rivers, and so forth In a typical city, water comes to you through pipes from the water supply company that took it from the ground What do you pay for when you pay your water bill each month You pay for the water you use, certainly, but built into the price of the water you use is the surety that when you turn the spigot, water will flow at a more or less constant rate The water sits in the pipes under pressure from the water company, waiting for you to turn on the spigot
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8: Understanding PC Power
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Electricity works essentially the same way as water Electric companies gather or generate electricity and then push it to your house under pressure through wires Just like water, the electricity sits in the wires, waiting for you to plug something into the wall socket, at which time it ll flow at a more or less constant rate You plug a lamp into an electrical outlet and flip the switch, electricity flows, and you have light You pay for reliability, electrical pressure, and electricity used The pressure of the electrons in the wire is called voltage and is measured in units called volts (V) The amount of electrons moving past a certain point on a wire is called the current or amperage, which is measured in units called amperes (amps or A) The amount of amps and volts needed by a particular device to function is expressed as how much wattage (watts or W) that device needs The correlation between the three is very simple math: V A = W You ll learn more about wattage a little later in this chapter Wires of all sorts whether copper, tin, gold, or platinum have a slight resistance to the flow of electrons, just like water pipes have a slight amount of friction that resists the flow of water Resistance to the flow of electrons is measured in ohms ( )
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Pressure = Voltage (V) Volume flowing = Amperes (A) Work = Wattage (W) Resistance = Ohms ( )
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An electrical outlet must have a ground wire to be suitable for PC use!
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A particular thickness of wire only handles so much electricity at a time If you push too much through, the wire will overheat and break, much like an overloaded water pipe will burst To make sure you use the right wire for the right job, all electrical wires have an amperage rating, such as 20 amps If you try to push 30 amps through a 20-amp wire, the wire will break and electrons will seek a way to return into the ground Not a good thing, especially if the path back to ground is through you! Circuit breakers and ground wires provide the basic protection from accidental overflow A circuit breaker is a heat-sensitive electrical switch rated at a certain amperage If you push too much amperage through the circuit breaker, the wiring inside will detect the increase in heat and automatically open, stopping the flow of electricity before the wiring overheats and breaks You reset the circuit breaker to reestablish the circuit and electricity will flow once more through the wires A ground wire provides a path of least resistance for electrons to flow back to ground in case of an accidental overflow Many years ago, your electrical supply used fuses instead of circuit breakers Fuses are small devices with a tiny filament designed to break if subjected to too much current Unfortunately, that breaking meant fuses had to be replaced every time they blew, making circuit breakers much more preferable Even though you no longer see fuses in a building s electrical circuits, many electrical devices such as a PC s power supply often still use fuses for their own internal protection Electricity comes in two flavors: direct current (DC) , in which the electrons flow in one direction around a continuous circuit, and alternating current (AC) , in which the flow of electrons alternates direction back and forth in a circuit (see Figure 82) Most electronic devices use DC power, but all
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