MYP Physics: Renewable & Non-Renewable Energy FAQ

Most of the trouble isn't the physics — it's classification. Students confuse "renewable" (naturally replenished, like solar or wind) with "sustainable" or "clean", then misjudge sources like nuclear or biomass. Add efficiency calculations and impact-evaluation questions (Criterion D) on top, and marks slip on definitions rather than maths.

A renewable source — solar, wind, hydro, geothermal, biomass — replenishes naturally within a human lifetime, so it won't run out. A non-renewable source — coal, oil, gas, uranium — took millions of years to form and is used up far faster than nature remakes it. That's the only definition examiners actually mark.

The MYP Sciences guide expects you to know solar, wind, hydroelectric, geothermal, biomass and tidal energy, including how each converts a natural process into electrical energy plus at least one genuine advantage and disadvantage of each. Some schools add wave power, depending on how your unit planner is written.

Efficiency compares useful output energy to total input energy, expressed as a percentage: efficiency = (useful output energy ÷ total input energy) × 100. Every joule not converted to useful output is wasted, usually as heat, so a lower efficiency means more energy lost — not necessarily less electricity produced overall.

An energy resource is where the energy starts — coal, wind, sunlight. An energy transfer (or transformation) is what happens to it afterwards, moving from chemical to thermal to kinetic to electrical. MYP questions often ask you to trace the full pathway from resource to useful output, and marks are lost when a step gets skipped.

This topic mainly sits under Criterion A (Knowing and understanding) and Criterion D (Reflecting on the impacts of science), each marked out of 8 according to the MYP Sciences guide. Criterion A tests definitions, transfer chains and calculations; Criterion D asks you to evaluate the environmental, economic or social impact of a named source using real evidence.

Expect "state" or "identify" for naming a source, "outline" for a brief transfer chain, "compare" for weighing two sources side by side, and "evaluate" or "discuss" when a Criterion D question wants advantages and disadvantages weighed against each other with a justified conclusion — not just listed separately.

The most frequent slip in marking is inverting the fraction — putting total input over useful output instead of the reverse, which produces an efficiency over 100%. The second most common error is forgetting to multiply by 100 and reporting a decimal, like 0.27, as though it were already a percentage.

Pick one variable you can genuinely change in a real experiment — panel angle for solar, blade pitch for a model turbine — and measure its effect on output energy or power. A strong investigation states a testable research question, identifies clear variables, and links results back to real-world efficiency limits.

Nuclear energy is non-renewable — uranium is a finite, mined fuel that isn't replenished naturally, even though nuclear power itself produces very low carbon emissions during generation. This is the single most common classification error I mark in MYP energy tests, so treat it as an exception rather than a pattern.

Hydroelectric power is generally the most efficient renewable source, often converting 80–90% of the kinetic energy of falling water into electricity, compared with roughly 35–45% for a modern wind turbine and 15–22% for a typical silicon solar panel. Efficiency isn't the same as availability — geography decides which source is actually usable.

Most students entering MYP 4-5 grasp the science fine — the trouble is exam language. Criterion D wants a judged, evidenced argument ("evaluate"), not a description, and students who write strong Criterion A answers often lose marks here from under-explaining impacts. Practising past-style questions against the actual criterion strands helps more than re-reading notes.

MYP renewable/non-renewable energy work builds directly toward Topic 8 (Energy production) in the current DP Physics guide, first examined in 2025, where the same efficiency and transfer concepts return with harder maths — Sankey diagrams, power station calculations and greenhouse-effect modelling. Solid MYP foundations here genuinely pay off at Diploma level.

Look for resources that separate the physics — efficiency calculations, transfer chains — from the evaluation skills, since MYP marks these under different criteria. On RevisionPrep, the MYP Physics Revision Notes and Topical Worksheets cover both strands with practice questions mapped to the actual assessment criteria, which is more useful than generic energy summaries.