how do commands on a screen direct electrical currents in a computer?

Question

I’m not asking what computer code is. I’m asking how typing in commands physically opens/closes the little switches in computers?

In: 2

Answer 1

When you type a command you are physically open/closing little switches in your keyboard. This makes your keyboard apply little voltages on the USB cable (or the Bluetooth emitter). When these voltages reach the motherboard it causes little switches to open/close. This causes little voltages to be applied in some CPU pins, which causes little switches to open/close, which causes little voltages in some CPU pins which causes little voltages in the HDMI/VGA port, which causes little voltages on the monitor, which causes little switches to open/close, which causes little voltages on little LEDs which cause them to light up which causes your eyes to see little dots which cause your brain to see an image.

TLDR: It’s you who indirectly physically opens/closes those little switches.