This has been on my mind for a while. Lets just take any electronics device. Lets say a mobile phone or a laptop. They have fixed voltage and current, but some components needs higher voltage/current or both. At the same time some components drains power (meaning consuming voltage and current), therefore leaving less power for next components. How do they maintain or amplify power for next components to use?
Might be a silly question, but I never got a clear answer to this question. I saw this thing with capacitors and diodes, how they amplify current, but I'm sure that it only works if you have ac power supply.