This video guides you through checking the AC adapter's wattage for your Dell system. By accessing the system documentation on Dell's support website, you can easily find the wattage and specifications.
To check the AC adapt to wattage. Open a web browser and go to the Dell.com/support. The system is automatically detected. Click on your system On your system page, click documentation.
Scroll down to manuals and documents, and under setup and specification, click on the PDF file link. Then scroll down. Search and click on Power adapter. And here you have the power adapter wattage and specifications for your model.