Voltage is still a little confusing?

I'm a little confused about voltage, it's the electrical "pressure" i know, but what is the purpose of lowering the voltage? What happens if the voltage is too much? Wouldn't adding resistors to change the amps have the same effect?

randofo11 days ago

I am not sure I understand your question. In what context are you talking about raising or lowering voltage?

If you are asking why things work at the voltage they do, that is a larger question that I am not sure I can satisfactorily answer for you.

Resistors in and of themselves don't change the voltage.

Lowering voltage lowers costs. You will not need to build your device as robustly, saving on components, and if your device is battery powered the batteries last longer.

Too much voltage, say 20 V, on a device designed for lower voltages, 5 V, causes component degradation/failure. It might not happen right away but it will happen.

Yes, adding more resistors will give the same effect but that costs more in components and needs more space for the intended design.