Electrical energy is transferred from the wall socket to the curling iron. Electrical energy is transformed to heat energy when the curling iron stays on. Heat energy is transferred to the hair that is being curled.
The international measurement system for energy is named "Système International d'Unités" (french abbreviation: SI). The international recognized unit for energy is the Joule (J), named after James Joule. He was the scientist who for the first time demonstrated the rule that work can be converted into heat.
Any form of energy can be transformed into another form. The process of energy transformation is also known as energy conversion.
Energy doesn't disappear - just changes the forms. Energy transformation is the process of changing energy from one form to another. This process is happening all the time.
Law of conservation of energy states that energy can change form, but it cannot be created or destroyed. That means the total amount of energy stays the always the same.
The main energy forms are:
Radiant (light) energy
Chemical energy
Mechanical energy
Nuclear energy
Electrical energy
Heat (thermal) energy
Energy of sound
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