As current increases, the wires heat which can cause a fuse to blow or a circuit breaker to trip. As additional branches are added to a parallel circuit, the overall resistance of the circuit decreases. A decrease in resistance creates an increase in current.
A battery (or other energy source), a light bulb (or other energy-consuming device), and conducting wires that connect the two terminals of the battery to the two ends of the light bulb make up a simple electric circuit.
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