How much power does your notebook need?
The notebook power adapter must be able to supply sufficient power to the notebook. Power is specified in number of Watts (W), e.g. 65W or 90W.
Important: always use a notebook power adapter that has equal or higher power output than the notebook requires. E.g., on a 90W notebook you can use a 90W or 120W adapter but not a 70W adapter.
Follow these steps:
- The power requirements are usually specified in Watts (W) on the original power adapter that was included with your notebook. See figure 1 (P). Common power outputs are 65W and 90W.
- When the output power is only specified in Volts (V) and Amperes (A), multiply those numbers to get the power output in Watts (W). In figure 1, the output power is: 18,5V x 3,5A = 64,75W (rounded off to 65W).
- If the original adapter is missing then check for a label on the notebook, check the user manual or contact the manufacturer of the notebook.
Figure 1: example of power adapter label