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The "why" is a bit hard to answer, but this is just part of a more general situation: you need an energy source to make ANYTHING work. The real reason for all this is the so-called "Second Law of Thermodynamics".Specifically in the case of an electrical circuit, a current will flow as a result of a voltage. The details are expressed in Ohm's Law.

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Q: Why is an energy source needed in order to have a working circuit?
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