When the battery is charged and the wires connected, what causes electric current to flow in the circuit?
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the potential difference between the ends of the circuit
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Every circuit is designed to do work, regardless of what kind of work - lets take ‘create light’ as a very simple example. this ‘circuit’ presents a ‘load’ to the battery terminals, be it a simple incandescent lamp, LED array with current limiting resistors or a circuit that creates a higher voltage by employing an inverter circuit and transformers or some other voltage multiplication method to create the required AC voltage to power a fluorescent lamp.
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