The amount of bending depends on the temperature difference between the two metals and the coefficients of thermal expansion. The greater the temperature difference, the more the strip will bend. The larger the difference in the coefficients of thermal expansion, the more the strip will bend for a given temperature difference.
Bimetallic strips are used in a variety of applications, including thermostats, thermometers, and circuit breakers. In a thermostat, the bimetallic strip is used to control the temperature of a room. When the temperature rises, the strip bends and makes contact with an electrical contact, which turns on the air conditioner. When the temperature drops, the strip bends in the opposite direction and breaks contact with the electrical contact, which turns off the air conditioner.
In a thermometer, the bimetallic strip is used to measure the temperature. The strip is attached to a pointer that moves along a scale. When the temperature rises, the strip bends and the pointer moves up the scale. When the temperature drops, the strip bends in the opposite direction and the pointer moves down the scale.
In a circuit breaker, the bimetallic strip is used to protect the circuit from overheating. When the current in the circuit increases, the strip heats up and bends. When the strip reaches a certain temperature, it breaks contact with an electrical contact, which opens the circuit and prevents it from overheating.
