CompTIA A+ 1101 Computer Power

Question 1

Computer Power Supply

Answer 1

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

Question 2

the rate of electron flow past a point in one second

Answer 2

Ampere (Amp)

Question 3

electrical pressure pushing the electrons

Answer 3

Voltage (Volt)

Question 4

• measured in Watts (measurement of real power use)
• volts x amps = watts

Answer 4

Power

Question 5

• US/Canada: 110 to 120 VAC, 60 Hz rate of alternation
• Europe: 220 to 240 VAC, 50 Hz rate of alternation
• use a power supply with a dual-voltage input option as voltage varies by country

Answer 5

AC (Alternating Current) VAC by Country

Question 6

• +12V for most modern components
• +5V for legacy components
• +3.3V for M.2 slots, RAM slots, and motherboard logic circuits
• +5V (standby voltage, used when in hibernate mode)
• -12V for integrated LAN, older serial ports, some PCIe cards
• -5V for lsa adapter cards (may not always be provided by the power supply)

Answer 6

Power Supply Output