Energy Efficiency Flashcards
1
Q
What is energy efficiency
A
Energy efficiency is the amount of energy transferred to useful forms
The more efficient, the less energy is wasted
2
Q
Energy efficiency equation
A
Useful energy
Energy efficiency= ——————
Total input energy
3
Q
What happens to wasted energy
A
The wasted energy is transferred into the surroundings which then dissipates into the atmosphere.
The wasted energy can also be stored in less useful forms
4
Q
Example question : wasted energy
A ball held above the floor has 100J of GPE. It is dropped. The GPE transfers into KE
Eventually the ball stops bouncing and has no GPE or KE. The energy in conserved
Where did the energy go?
A
The energy has dissipated into other forms e.g. Sound and heat
