# how to compensate power drains in dc circuits?

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.

• I don't really get what you mean by "next components to use". – PlasmaHH Feb 20 '15 at 13:39
• Voltage is not "consumed" like that. – pjc50 Feb 20 '15 at 13:42

They have fixed voltage and current...
• I'm not sure I follow this part of the answer:Note that there is power amplification; the battery can only supply the energy that is stored within it.. What do you mean by it? Could it be that there's a no missing? – AndrejaKo Feb 20 '15 at 14:39