Our office recently installed new wall plugs with both the Type D plug outlet (South Africa) and a USB point to charge your phone straight from the wall, without the need for the little white charger that you’d otherwise use.
IF we can use electricity straight from the wall into the phone/powerpack/battery through a USB cable, what is the use of a charge and how exactly does it work?
In: 3
The phone needs a very small voltage to charge safely. Voltage is like the electrical version of water pressure. To much pressure will wreck circuits. It only takes 5Volts to charge but the wall socket has 230volts. The plug-in usb charger that comes with your phone reduces the 230 volts (electrical pressure) to just 5volts using a “step down transformer” a “rectifier” and “voltage regulator” But it has extra components inside that will protect your expensive phone. If for example, the usb cable is damaged. The wall sockets with built in usb ports tend to have cheaper circuits. if that circuit burns out you cannot unplug it. Also you cant take them with you travelling.
Bigclive.com did a teardown of one of these sockets. https://youtu.be/zoZ1_aEDPos
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