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Physics Paper 1
Energy Stores and Transfers
Energy cannot be created or destroyed, only transferred.
Key Facts
- Energy is conserved.
- Power = energy transferred per second.
Key Equations
power = energy / time
efficiency = useful output / total input
Topics Covered
Energy Stores
What you need to know
- •Energy can be stored as kinetic, thermal, chemical, or gravitational potential.
- •Energy is transferred by heating, radiation, or mechanical work.
Exam Tips
- Use the energy transfer model to explain changes clearly.
Key Terms
Power
Rate of energy transfer or work done.
Efficiency
How much input energy is converted into useful output.
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Common Exam Questions
Calculate the power if 600 J is transferred in 3 seconds.
2 markseasyPhysics Paper 1
Model Answer
Power = 600 / 3 = 200 W.
What examiners want to see
- ✓Use the correct formula.
- ✓Show the substitution and final unit.
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