麻豆约拍

An introduction to a simple electrical circuit. The battery pushes the electricity along the wires from the positive terminal, through the bulb and back to the negative terminal. This creates a circuit. To turn out the light, the circuit needs to be broken by adding a switch. It does not matter where the switch goes, as the effect is the same. The bulb glows because electricity flows through the filament and makes it hot. When the bulb gets old, the filament breaks and this breaks the circuit.