The kinetic energy of moving charge in an electrical circuit is called current. A circuit contains a power source (say a battery) and provides a closed path for electrons to flow. A very simple circuit consists of a battery, switch and bulb, all connected through conducting wires. In such a closed circuit, the potential difference between the two battery terminals will cause electrons to flow. Electrons move through the circuit from negative terminal to the positive terminal. Current, by convention, moves in the opposite direction, that is, from positive terminal to the negative terminal. The battery provides potential energy to the electrons, which is converted to their kinetic energy when the circuit is completed. This causes electrons to move and we get current flow.
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