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Transcript
Give examples of appropriate power supplies for various scenarios. Objective 103.04 – 2% © ExplorNet’s Centers for Quality Teaching and Learning 1 Connector Types and Voltages o 20-pin – main power connector to older motherboards o 24-pin - main power connector to newer motherboards; many power supplies use a 20+4 power connector to support both types of boards © ExplorNet’s Centers for Quality Teaching and Learning 2 Connector Types and Voltages o 4/8-pin 12v - provides 12V for extra CPU power on most newer motherboards o PCIe 6/8-pin - auxilliary power connector for PCIe devices © ExplorNet’s Centers for Quality Teaching and Learning 3 Connector Types and Voltages o SATA – special 15-pin L-shaped connector capable of delivering 3.3, 5 and 12 volts o Molex – the most common type of power connection for devices that need 5 or 12 volts © ExplorNet’s Centers for Quality Teaching and Learning 4 Connector Types and Voltages o Floppy – mini connector, also known as Berg, supplies 5 and 12 volts to 3.5” floppy disk drives © ExplorNet’s Centers for Quality Teaching and Learning 5 Specifications Wattage o Power rating of a power supply o Minimum power needed is figured depending on the total number of devices being powered and their wattage needs o 300 watts is the minimum recommended for new systems © ExplorNet’s Centers for Quality Teaching and Learning 6 Specifications Size (form factors) o The demand for smaller and quieter PCs has led to the development of a number of power supply form factors o All use standard ATX connectors o Mini-ATX and Micro-ATX are smaller power supply form factors © ExplorNet’s Centers for Quality Teaching and Learning 7 Specifications Number of Connectors o Modern power supplies include a lot of connectors o Cheaper models come with as few as 10 while more powerful models come with 25 or more © ExplorNet’s Centers for Quality Teaching and Learning 8 Dual Voltage Options o In the United States, standard AC is between 110 and 120V o The rest of the world uses 220-240 VAC o Most power supplies are dual-voltage and compatible with both options © ExplorNet’s Centers for Quality Teaching and Learning 9 Automatic Switching Power supplies that detect the input voltage and adjust accordingly to provide the PC with adequate power © ExplorNet’s Centers for Quality Teaching and Learning 10