220-801 · Question #1030
Which of the following BEST describes the purpose of an inverter in a laptop?
The correct answer is D. Provide power to the backlight of the screen. The primary purpose of a laptop inverter is to provide the correct type of power (AC) to the CCFL backlight so the screen can be illuminated.
Question
Which of the following BEST describes the purpose of an inverter in a laptop?
Options
- AAllow for more than two USB devices to access power
- BConvert direct current to alternating current
- CRotate the image to properly align it with the user
- DProvide power to the backlight of the screen
How the community answered
(43 responses)- A2% (1)
- B2% (1)
- C5% (2)
- D91% (39)
Why each option
The primary purpose of a laptop inverter is to provide the correct type of power (AC) to the CCFL backlight so the screen can be illuminated.
Providing power to USB devices is handled by the USB controller and system power rail management, not the display inverter.
While an inverter does convert DC to AC as its mechanism, this choice describes only the electrical process and not the specific purpose it serves in the laptop, which is backlight power delivery.
Rotating the display image is a software or GPU function controlled by display drivers and orientation sensors, and has nothing to do with the inverter hardware.
The inverter's role in a laptop is specifically to power the backlight of the screen by converting the system's DC power to the AC voltage required by the CCFL fluorescent tube. Without a functioning inverter, the backlight receives no power and the display appears dark, even though the LCD panel and video signal remain operational.
Concept tested: Laptop inverter purpose for backlight power
Source: https://www.comptia.org/certifications/a
Topics
Community Discussion
No community discussion yet for this question.