The design of the thermostat of an electric iron is based on the
Answer Details
The design of the thermostat of an electric iron is based on the "increase in the size of metals when heated".
The thermostat of an electric iron is designed to maintain a constant temperature of the iron's metal plate. It consists of a bimetallic strip made up of two different metals that have different coefficients of thermal expansion. This means that when the temperature changes, the two metals expand at different rates, causing the strip to bend.
The bending of the bimetallic strip is used to control the temperature of the electric iron. When the iron is switched on, the bimetallic strip heats up and bends, which then opens or closes the electrical contacts that control the heating element. As the temperature rises, the strip bends further, eventually causing the contacts to open and turn off the heating element. As the temperature falls, the strip bends in the opposite direction, causing the contacts to close and turn on the heating element again.
The reason why the bimetallic strip bends is due to the different coefficients of thermal expansion of the two metals. When heated, one metal expands more than the other, causing the strip to bend. This bending action is used to control the temperature of the electric iron.
In summary, the design of the thermostat of an electric iron is based on the "increase in the size of metals when heated". The bimetallic strip used in the thermostat is made up of two metals with different coefficients of thermal expansion, which causes the strip to bend when heated, and is used to control the temperature of the iron.