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TL;DR: You really need to know what components you have and you need to find datasheets. In the datasheet, you find what voltage the component requires. Don't care too much about amperes in the beginning. If you get the voltage right, each component will just draw as much current as it needs. An Arduino Uno operates from 7 to 12 Volts, so 7.4 V is ok. "...

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