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Can the power adapter be universal?

1. Power adapters of different specifications cannot be used universally


① The voltage must be different, otherwise it will burn the electrical appliances or fail to work.


②The output current of the power adapter must be greater than the working current of the electrical appliance, otherwise, the power adapter will "overcurrent" and burn out.


③The interface of the power adapter and the electrical appliance must match, otherwise it cannot be connected.


④The positive and negative polarities should be different to avoid accidents.


2. What kind of power adapter can be used universally?


The power adapter with proper voltage and current not less than the original power supply can be exchanged. The meaning of proper voltage means that the voltage of the power adapter only needs to be higher than the battery voltage of the notebook 4V to be able to use it, otherwise, due to the insufficient voltage, the notebook charging and maintenance circuit cannot be opened due to the working pressure difference required by the circuit.