Editing AC adapter (section)

===Laptop charger===
In early [[laptop]] computers, the [[power supply unit]]s were internal like in [[desktop computer]]s. To facilitate portability by sparing physical space and reducing the weight, power supply units were externalized.<ref>{{cite web |url=https://www.pcworld.idg.com.au/slideshow/353969/gallery-25-years-toshiba-laptops/|title=Gallery: 25 years of Toshiba laptops }}</ref>

When a laptop computer is operated while recharging, the [[integrated circuit]]ry which controls the charging makes use of a power supply unit's remaining [[electrical current]] capacity. This allows supplying the device's components with power during usage while maintaining an uncompromised constant charging speed.