3.5 Given a scenario, install or replace the appropriate power supply Flashcards
Meaning of PSU?
Power Supply Unit
What do PSUs do?
Sends low-voltage DC power to PC components
DC = Direct Current
Why do PSUs contain a rectifier?
To convert AC power to DC power
(AC = Alternating Current) (DC = Direct Current)
3 components that PSUs comprise of?
- Rectifier
- Transformers
- Filters & regulators
Another important component would be the fan, which dissipates the heat generation
Purpose of PSU’s rectifier?
Convert AC power to DC power
Purpose of PSU’s transformers?
Lower voltages
Purpose of PSU’s regulators?
To ensure consistent output voltage levels
2 factors that determines the power supply’s compatiblity?
- Size
- Power connectors
Most PSUs designed for use with desktop PCs are based on the ATX form factor
What voltage is typically used in North America?
120 VAC
What voltage is typically used in the United Kingdom?
230 VAC
What does it mean that most PSUs are dual voltage & auto-switching?
They can adapt to different input voltages automatically
Some PSUs feature a manual voltage switch; fixed types suit either low-line or high-line voltages. Clear voltage compatibility indication is crucial in PSUs and their documentation.
What is the range of low-line VAC?
This would be used in regions like North America
100-127 VAC
What is the range of high-line VAC?
This would be used in regions like teh United Kingdom
220-240 VAC
What is power measured in?
Watts
How is Watts calculated?
Voltage multiplied by current (V*I)