3.5 - Computer Power Flashcards
What should you always do before working inside your computer?
Disconnect from the power source.
What should you do if you hear advice to keep everything plugged in while working on your computer?
Disregard that advice and always disconnect from every power source.
What is a challenge when working with components that have capacitors?
They can store power and still shock you even when unplugged.
How should you handle electrical components to avoid shocks?
Never connect any part of your body to any part of the electrical system, including the electrical ground.
What type of current do computer motherboards and components use?
Direct Current (DC).
What type of current is received from the power outlet?
Alternating Current (AC).
What is the purpose of a computer power supply?
To convert AC power from the outlet to DC power for the computer components.
What voltages are commonly provided by power supplies?
3.3V, 5V, and 12V DC.
What is the unit of measurement for the rate of electrons flowing through a wire?
Ampere (or Amp, abbreviated as A).
What does voltage refer to in electrical systems?
The force pushing the electricity through a wire.
What is a watt and how is it calculated?
A watt is a measurement of real power use, calculated by multiplying volts by amps.
What is the frequency of alternating current in the US and Canada?
60 Hertz (Hz).
What is the frequency of alternating current in Europe?
50 Hertz (Hz).
What does a power supply switch allow you to do?
Change between different voltage settings, such as 120V and 230V.
How does a power supply convert AC to DC?
By providing multiple voltages of DC power for different components.
What are the common DC voltages used by modern motherboards?
+3.3V, +5V, and +12V.
What is the purpose of the +5V SB (Standby) voltage?
To keep the system ready to wake up from hibernation mode.
Why might older components use negative voltages like -12V or -5V?
For older serial ports or legacy systems.
What is the maximum power output of a typical power supply mentioned in the example?
850 watts.
How do you connect a power supply to a motherboard?
Using a large 24-pin connector that locks into place.
What are modular power supplies?
Power supplies with detachable cables that allow you to use only the connections you need.
What is a hybrid power supply?
A power supply with both fixed and modular cables.
How should you size a power supply for your system?
Based on the wattage needed for all components, often doubled for efficiency and future upgrades.
Why is it important to check power supply compatibility with your system?
To ensure it fits in the case and meets the power requirements of your components.
