Simplify the following text for a Grade 4 native English-speaking person.
Original: One form of energy can often be readily transformed into another with the help of a device - for instance , a battery , from chemical energy to electric energy ; a dam : gravitational potential energy to kinetic energy of moving water ( and the blades of a turbine ) and ultimately to electric energy through an electric generator .
Simplified: When energy changes from one form to another , the amount of energy stays the same . Energy can not be made or destroyed .