WHAT' HAPPENS TO ENERGY WHEN IT'S USED?

Energy never disappears, it can be transfromed from one type of energy into another, but it doesn't disappear completely.
Some common energy transformations:

• Chemical energy: Aeroplanes and cars transform the chemical energy in fuel and petrol into kinetic and thermal energy.
• Electrical energy: fans and electrical drills transform electrical energy into kinetic and thermal energy.
• Light energy: Solar panels transfrom light eenrgy from the Sun into electrical energy during the day.

Picture from Texas Gateway