How does electric iron box works?

                              


Hey guys welcome back to my website to day I came with a interesting topic that is how does electric iron box works? 

We will change the position of knob to iron different types of cloths. This knob has a connection with Thermometer. Let’s see with a experiment.

EXPERIMENT:

                        Here I am taking a aluminum rod connecting with a needle if the rod moves the needle also will move. So I am going heat the aluminum rod. The needle in the rod automatically moves. I not even touched it but when I heat it moves. Why ?

WHY IT HAPPENS?

                              The all objects in the world are made up of atom. This atom and molecules will not be stable at one particular place. They will always be in moving or vibrating. The atoms in the aluminum rod will be vibrating in the room temperature. If we increase the temperature by heating it, the atom in the aluminum starts vibrating 10 times higher. If we heat an object it increases its size and volume. This is called as thermal expansion. By this thermal expansion there will be no change in mass. So by this there will be chances to expansion in railway track and bridges, it is the reason for the gaps in that. This like Eiffel tower will increase 6 inches in summer and decrease 6 inches in winter. This thermal expansion is depend upon different objects for example when I heat aluminum it size will increase the same when I heat steel with the same temperature the size will increase little bit. One objects that heated by a certain temperature and the increase in ratio is called as coefficient of thermal expansion. Now I am taking brass and steel, and I am joining both and heating it. You will see that they bent little bit while heating. This method is called bimetallic strip. Now take Iron box, in the iron box there will be one heating coil and there will be one bi metallic strip. When we turn the knob , the iron box will start heating , the bi metallic strip also starts heating and bent so that the passage of current will be stopped. This is the reason that the light in iron box turn on and off. By this method the Bimettalic thermometer also works. Thanks for Reading

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Author – Pranav

Content – LMES