Final answer:
An iron converts electrical energy into heat energy to straighten clothes by relaxing fabric fibers.
Therefore, the correct option is: C) Heat
Step-by-step explanation:
The types of energy that an iron uses to straighten clothes primarily include electrical energy and heat energy. When the iron is plugged in, it converts electrical energy into heat energy.
This heat energy is then transferred to the clothes to relax fabric fibers and remove wrinkles, thereby straightening them. The iron does not use mechanical, magnetic, or any other forms of energy for its primary function of straightening clothes.
Additionally, irons are designed to operate with a consistent electrical current to maintain the desired temperature for smoothing clothes.
The type of energy that iron uses to straighten clothes is heat. When the iron is plugged into an electrical outlet, it uses electrical energy to heat up its internal heating element. This heat energy is then transferred to the clothes, causing the fibers to relax and straighten out.