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True or False: Computers use DC powerTrue
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What are the 3 output voltages of PSUs?3.3, 5, and 12V
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What is an Ampere?The unit of measure for electron flow rate
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What is a Volt?The unit of measure for the difference in electrical potential between two devices, the “pressure”
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What is a Watt?The unit of power consumption, V x A = W
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What is the voltage and frequency of North American power?110-120V AC, 60Hz
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What is the voltage and frequency of European power?220-240V AC, 50Hz
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True or False: PSUs sometimes have features that make them compatible with both American and European power standardsTrue
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True or False: An American standard rated PSU can work on a European supplyFalse - The electrical differences will destroy the computer
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What components use +12V?PCIe, HDD motors, fans, most modern components
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What components use +5V?Some motherboard components, though most use 3.3V in modern systems
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What components use +3.3V?M.2, RAM, and motherboard logic circuits
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What is +5VSB?The standby voltage for external devices like keyboards and mice
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What components use -12V?Integrated LAN, older serial ports, older PCI cards
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What components use -5V?ISA adapter cards, largely defunct
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True or False: A 24-pin motherboard power connector is compatible with a 20-pin motherboardTrue
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What systems may require redundant power supplies?Servers or always-on systems
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What is a good rule of thumb when selecting a PSU wattage?Full operation should only use 50% of the available power
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What is the most important thing to remember about computer power?
Safety, electricity will kill you, always disconnect the device from its power source before working on it, discharge capacitors, never touch a live component
