Energy: Heat, Light and Sound

Where this fits in the syllabus

Grade 10 · Term 3

Key points to revise

Revise Energy: Heat, Light and Sound fast with concise, exam-ready key points

About O/L Science: O/L Science integrates physics, chemistry, and biology into a single subject across Grade 10 and 11.

• Energy forms: kinetic, potential (gravitational/elastic), thermal, chemical, electrical, nuclear, light, sound
• Conservation of energy: energy is never created or destroyed — only converted
• GPE = mgh; KE = ½mv²
• Efficiency = (useful output / total input) × 100%
• Power P = Energy / time (Watt = J/s)

Must know

• Only ~10% energy transferred per trophic level; 90% lost as heat
• Biomass pyramid: wide base (producers) → narrow top (top consumers)
• Renewable: solar, wind, hydro, biomass; Non-renewable: coal, oil, gas, nuclear
• Joule (J) is the SI unit of energy; Watt (W) = Joule per second (power)

Source: NIE O/L Science Grade 11 — Unit 4: Energy in Ecosystems

Study these first

Builds toward

Related Topics

In the Syllabus