Simulation of Energy transfer

Energy, Physics, Science

Use the simulation in your science or Physics class to illustrate Energy transfer.

Here are concise exam tips for energy transfer questions (mainly GCSE/IGCSE level physics — focus on AQA/Edexcel style):

Core Rules to Always State

  • Energy cannot be created or destroyed → only transferred or dissipated.
  • Use the phrase: “Energy is transferred from the … store to the … store by … pathway.”

8 Energy Stores (memorise exactly)

  1. Kinetic
  2. Gravitational potential (GPE)
  3. Elastic potential
  4. Thermal
  5. Chemical
  6. Magnetic
  7. Electrostatic
  8. Nuclear

4 Energy Transfer Pathways (use correct wording)

  1. Mechanically (by a force / work done)
  2. Electrically (by current / potential difference)
  3. By heating (temperature difference)
  4. By radiation (waves — light / infrared / sound)

Sankey Diagrams & Efficiency

  • Arrow width ∝ energy amount
  • Useful output / total input × 100%
  • Wasted = total input – useful output
  • Efficiency is always < 100% (because of dissipation)

Most Common Lost Marks — Avoid These

  • Saying “energy is lost / used up / converted to heat” → say dissipated to thermal store of surroundings
  • Writing “friction energy” or “heat energy” as a store → no such thing; friction causes transfer by heating to thermal store
  • Forgetting the pathway (just writing store → store loses 1–2 marks)
  • Saying energy is transferred to surroundings instead of dissipated to thermal store of surroundings
  • Missing unit conversions (especially time → seconds for E = P × t)
  • For appliances: main useful transfer is usually electrical → kinetic / thermal / sound / light (not “electrical energy” as final store)

Quick Wins in 6-mark Describe Questions

  1. Define system (e.g. “the falling object” or “the bulb + surroundings”)
  2. Start store → useful end store + pathway
  3. Wasted pathway(s) → thermal store of surroundings
  4. Say “principle of conservation of energy”
  5. Mention efficiency is low because most energy is dissipated

Calculation Traps

  • E = P × t → t must be in seconds
  • Always show working + unit (J)
  • Efficiency = useful / total (not the other way round)

Memorise stores + pathways → practice drawing quick Sankey arrows → always write pathway.

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