A simple electric circuit model shows how electricity flows through a path to power a device. It usually includes a battery (or cell) as the power source, wires to carry the electric current, and a bulb or buzzer as the output device. When the circuit is complete, meaning there is a continuous path from one end of the battery to the other through the wires and bulb, the electric current flows and the bulb lights up. If the circuit is broken, like if a wire is disconnected, the current cannot flow and the bulb stays off. This model helps us understand how electricity works and why a complete circuit is needed for devices to function.