Question

State the energy change in the following case while in use: An electric iron.

Answer 1

Hint: Since, we know that an electric iron is used to press our clothes. The electric iron produces heat and this heat helps in the pressing of our clothes. We will therefore, apply this basic concept as well as the law of conservation of energy. These two will help to get the required answer.

Complete answer:
We know that an electric iron or heater is an electrical device that converts an electric current into heat. An electric iron is used to press the clothes more quickly and effectively. There is a heating element present inside every electric heater and is called an electrical resistor, and works on the principle of Joule heating. According to this an electric current passing through a resistor will convert the electrical energy into heat energy.
Therefore it can be said that in an electric iron the electric energy changes into heat energy.

Additional information:
As we know that energy is defined as the ability to do work. Energy can be found in many things and can take different forms, like-kinetic energy is the energy of motion, and potential energy is energy due to an object's position or structure. Total energy of a system is given by the sum of kinetic energy and potential energy.
We also know that, according to the law of conservation of energy, energy can neither be created nor be destroyed; rather it can only be transferred from one form to another. Here, in this question electrical energy is transferred to heat energy.
We should also know about the power. It is the amount of energy transferred or converted per unit time. In the International System or S.I Unit of power is the watt. The S.I unit of power can also be written as one joule per second. Power is a scalar quantity, which means it has only magnitude not direction.

Note:
We should remember that the laws of conservation of energy can never be violated in any case. According to the law of conservation of energy, energy can neither be created nor be destroyed; rather it can only be transferred from one form to another.