What you'll learn
Energy stores, transfers and efficiency.
Energy
- Energy stores (kinetic, GPE, thermal, elastic) and transfers.
- Conservation of energy; work done = force × distance.
- Power (rate of transfer); GPE = mgh; efficiency.
Exam tips
- Efficiency = useful output ÷ total input.
- Distinguish energy stores from transfers.
Common mistakes
- Confusing energy and power.
- Forgetting wasted energy is usually heat.