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How does electric current travel through a battery-powered circuit?
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battery
Cutaway view of an alkaline–manganese dioxide power cell.
In a battery-powered circuit, electric current is generated through an electrochemical reaction that converts chemical energy into electrical energy.1
The process functions as follows:
- Internal Flow: Inside the battery, chemical reactions occur at the anode and cathode. The anode releases electrons, while the cathode accepts them. An electrolyte within the battery allows ions to move, balancing the flow of charge and maintaining the circuit's operation.2
- External Flow: When a conductive path, such as a copper wire, is connected between the battery's terminals, it creates an external circuit. Electrons flow from the negative terminal through this conductor to the positive terminal. This movement of electrons constitutes an electric current.3245
- Energy Transfer: As electrons move through the external circuit, they may pass through devices like resistors or lamps, where their energy is converted into other forms, such as heat or light.63
The battery maintains a potential difference (voltage) that drives this continuous flow of electrons until the chemical reactants are consumed.462