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Electricity, as you probably already know, is the flow of electrons through a conductive path like a wire. This path is called a circuit.Batteries have three parts, an anode (-), a cathode (+), and the electrolyte. The cathode and anode (the positive and negative sides at either end of a traditional battery) are hooked up to an electrical circuit.
The chemical reactions in the battery causes a build up of electrons at the anode. This results in an electrical difference between the anode and the cathode. You can think of this difference as an unstable build-up of the electrons. The electrons wants to rearrange themselves to get rid of this difference. But they do this in a certain way. Electrons repel each other and try to go to a place with fewer electrons.                           
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Battery nothing but a energy source .. consiting of 2 terminals ... + and -.........................  the current travels from  - to +...... 

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