# Power supplies

### Description

More in depth look at how power supplies work to power a computer and where power comes from. Also how electricity works
Flashcards by Jessica Rizo, updated more than 1 year ago
 Created by Jessica Rizo almost 2 years ago
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## Resource summary

 Question Answer What is an Amp? Ampere (Amp, A) The rate of electron flow past a point in one second *the diameter of a water hose What is a Volt? Voltage(volt, V) Electrical “pressure” pushing the electrons *how open the faucet is What is a Watt? Wattage (watt, W) Measurement of real power use *the total amount of water How do you calculate wattage? Volts X Amps= watts What is an Ohm? How much resistance or barrier something creates against electricity What is AC? Alternating Current Constantly reversing the direction of power Comes out of power outlets What is he voltage of AC in US/Canada? 110-120v at 60HZ (hertz) What is the voltage of AC in Europe? 220-240v at 50HZ What is DC? Direct Current Moves in one direction with constant voltage What happens if you plug a device that needs more power Your device won’t work but no serious harm will happen What happens if plug in a device to a higher power source? Can seriously damage your device How much power does the Molex power connector supply? Provides +3.3v, +/-5v, and +/-12v What is +12v on the Molex used to power what components? Powers larger components like PCIe adapters, hard drive motors, cooling fans What does the +5v help to power? Can help to power M.2 slots and RAM slots What does +3.3v help to power? With MOBOs being more efficient, +3.3v now power M.2 and RAM slots What does -12v power? On older computers they power integrated LANs, serial ports, PCI cards *don’t see this much these days What does -5v help to power? Powers older components that you don’t see much these days What are power supplies rated in? Watts

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