Computer Power - CompTIA A+ 220-1201 - 3.6

Power Supply

Converts 120 V AC or 240 V AC to 3.3 V DC, 5 V DC, and 12 V DC

Ampere (amp, A)

The rate of electron flow past a point in one second

Voltage (volt, V)

Electrical "pressure" pushing the electrons

Watt (W)

- Measurement of real power uuse

- Volts * amps = watts

- 120V * .5A = 60W

Alternating Current (AC)

- Direction of current constantly reverses

- Distributes electricity efficiently over long distances

Direct Current (DC)

Current that moves in one direction with a constant voltage

24-pin Motherboard Power

- Main motherboard power that provides +3.3 V, +/-5, and +/- 12 V.

Redundant Power Supplies

- Two (or more) power supplies

- Each power supply can handle 100% of the load

- Hot-swappable