FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -There is an indirect way of powering Rpi through USB ports. We can do this by powering the Rpi with a Micro USB or USB C port and then supplying power through USB ports. Then remove the Micro USB or USB C power supply and your Rpi will still work.

Detailed explanation-2: -Powering using a micro-usb cable Another way to power the Raspberry Pi is with a micro-usb cable connected to a usb port on a laptop. Note that there are different types of usb connectors. The Raspberry Pi uses a micro-usb connector. You can also directly power it with an AC adapter.

Detailed explanation-3: -4. How power supply is done to RPi? Explanation: The unit uses a Micro USB connection to power itself (only the power pins are connected so it will not transfer data over the connection). A standard modern phone charger with a micro USB connector will do, but needs at least 700 mA at 5 volts.

Detailed explanation-4: -The official Raspberry Pi 12.5W Micro USB Power Supply is the latest recommended power supply for all micro USB-powered Raspberry Pi computers.

Detailed explanation-5: -Yes, you can still power the Raspberry Pi 4 from pins on the GPIO header. Supply a well-regulated 5V to pins 2 and 4, and ground to pin 6. Be very careful, however not to accidentally apply 5V to any of the other pins, as the I/Os are intended for 3.3V operation.