This demonstration bimetallic strip is mounted on a plastic base measuring 130 x 80 x 30mm. A 12V halogen bulb is positioned below the metallic strip to provide heat. When the bulb heats the bimetallic strip, the strip bends upward, breaking the circuit and turning off the bulb. As the strip cools, it straightens, completing the circuit again and relighting the bulb. This repeating cycle demonstrates the principle of differential thermal expansion in bimetallic materials and the operation of a basic thermostat mechanism.