- When one kind of energy changes into another kind of energy , the total amount of energy is constant
- Energy transformation means one kind of energy changes into another kind of energy
- Therefore, when energy transformation happens, the total amount of energy is constant

- When energy transformation happens, the total amount of energy is constant
- Energy transformation means energy conversion
- Hence, when energy conversion happens, the total amount of energy is constant

Therefore, when energy conversion happens, the total amount of energy is constant
In a closed system, what happens to the total energy of the system as energy conversions take place?
- When one kind of energy changes into another kind of energy , the total amount of energy is constant 
- Energy transformation means energy conversion 
- Energy transformation means one kind of energy changes into another kind of energy