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power supply Also known as a power supply unit (PSU). A box inside a computer case that supplies power to the motherboard and other installed devices.
power supply tester Used to measure the output of each connector coming from the power supply.
radio frequency interference EMI in the radio frequency range.
rectifier An electrical device that converts AC to DC. A PC power supply contains a rectifier.
resistor An electronic device that resists or opposes the flow of electricity. A resistor can be used to reduce the amount of electricity being supplied to an electronic component.
riser card A card that plugs into a motherboard and allows for expansion cards to be mounted parallel to the motherboard. Expansion cards are plugged into slots on the riser card.
soft power Another term for a soft switch.
soft switch A feature on an ATX or BTX system that allows an OS to power down the system and allows for activity such as a keystroke or network activity to power up the system. Also called soft power.
spikes Temporary surges in voltage, which can damage electrical components. Also called swells.
static electricity An electrical charge at rest. Also known as electrostatic discharge (ESD).
surge protector or surge suppressor A device or power strip designed to protect electronic equipment from power surges and spikes.
tower case The largest type of personal computer case. Tower cases stand vertically and can be as high as two feet tall. They have more drive bays and are a good choice for computer users who anticipate making significant upgrades.
transformer A device that changes the ratio of current to voltage. A computer power supply is basically a transformer and a rectifier.
transistor An electronic device that can regulate electricity and act as a logical gate or switch for an electrical signal.
uninterruptible power supply A device designed to provide a backup power supply during a power failure. Basically, a UPS is a battery backup system with an ultra-fast sensing device.
volt A measure of potential difference in an electrical circuit. A computer ATX power supply usually provides five separate voltages: +12 V, -12 V, +5 V, -5 V, and +3.3 V.
voltage selector switch A power supply might have a voltage selector switch on the back. Often, the voltage selector switch on the power supply can be set to 230 V or 115 V. When in the United States, set the switch to 115 V.
voltage selector switch The unit used to measure power. A typical computer may use a power supply that provides 200 W.
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