Dell Inspiron 11 (3147, Mid 2014) - Manual (Page 16)

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Power Adapter
About Your Computer
Power Adapter
Power adapters are used to supply power to portable computers and certain
desktop computers. The Dell power-adapter kit consists of the power
adapter and the power cable. The power-adapter rating (65 W, 90 W, and
so on) depends on the computer it is designed for, and the power cable
varies based on the country where the power adapter is shipped.
CAUTION: To avoid damaging your computer, it is recommended
to use only the power adapter that shipped with your computer or
a Dell‑approved replacement power adapter.