Is the power adapter for laptops universal?

There are three obstacles to the power adapter that is not universal. The first is the different voltages used by notebook computers of various manufacturers. IBM is 16V, COMPAQ is mostly 18.5V, and some SONY models are 19.5V. The second is that different notebook computers require different currents, ranging from 2A to 5.4A. Smaller machines require less current, and larger machines have larger currents. The third is that the power adapter interfaces of notebook computers of various manufacturers are different, and it is difficult to be universal. Therefore, there is currently no universal power adapter for all notebook computers.

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