Grade 10 — Term 3
Aligned with NIE syllabus
This term in the Idasara Academy app has 3 lessons (NIE Units 4, 7, 8). For each lesson, this page gives you the points you must know and one exam-style question with its answer. None of it needs an account.
Is this what my class is doing now?
Maybe not. The Idasara app groups lessons into its own terms, and your school may teach them in a different order. Where we know a lesson's NIE unit, it is shown on the lesson. Find the unit your class is on, and start there.
Lessons in This Term
Forms and Transformations of Energy
NIE Unit 4
What you 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)
Electricity and Simple Circuits
NIE Unit 8
What you must know
- Power: P = IV = I²R = V²/R; unit = Watt (W)
- Series: same I throughout; V_total = V₁ + V₂; R_total = R₁ + R₂
- Parallel: same V across branches; I_total = I₁ + I₂; 1/R_total = 1/R₁ + 1/R₂
- Household wiring = parallel (each appliance gets full voltage)
- Fuse/circuit breaker: protects circuit from excess current
Pollution, Climate Change and Conservation
NIE Unit 7
What you must know
- Enhanced greenhouse effect → global warming → climate change
- Acid rain: SO₂ + H₂O → H₂SO₄; damages forests, lakes, buildings
- Ozone layer: absorbs UV; CFCs deplete it
- Conservation: biodiversity protection, reforestation, renewable energy, recycling
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