What is the name of the plug that connects to the laptop power cord?

That head is powered, generally DC, the following laptop charging power to do a brief introduction:

Definition: Laptop Charger (Laptop Charger), that is, the laptop charger. The traditional laptop charger can only output a single voltage to a model of laptop charging, the industry called this traditional laptop power adapter for a single-band laptop charger (mainly to distinguish from the universal laptop charger.) ?

Working principle: As the family power supply is generally about 100V-240V (alternating current, referred to as AC), small

car and airplane power supply is generally about 12V (direct current, referred to as DC), but these three commonly used power supply is unstable, can not be given to the laptop computer direct charging, otherwise it will damage the battery and the laptop computer. Laptop demand for power for stable constant voltage DC. So the working principle of the laptop power adapter is simple: it is the unstable power supply using the principle of switching power supply through the conversion circuit into a laptop computer needs constant voltage DC power, power supply and charging to the laptop computer.

Basic Composition: Input Cable + Charger Body + Output Cable + Connector