Curriculum
Science — Third Preparatory
Science — Third Preparatory
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Unit 1 — Chemical Reactions and Their Environmental Impacts
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Question bank: Unit 1 — Chemical Reactions and Their Environmental Impacts
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Unit 2 — Electricity and Magnetism
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- 1.1 Free electrons and electric current
- 1.2 Electric current intensity
- 1.3 Electric potential difference (voltage)
- 1.4 Electric sources and electromotive force
- 1.5 Connecting electric cells
- 1.6 Electric resistance
- 1.7 Circuit symbols and circuit diagrams
- 1.8 Summary of Lesson 1
- 2.1 How is the current in a conductor determined? Ohm's law
- 2.2 Connecting identical resistors
- 2.3 Electric power and energy
- 2.4 Electrical safety
- 2.5 Summary of Lesson 2
- 3.1 The magnetic effect of electric current
- 3.2 The electromagnet
- 3.3 Magnetic force on a current-carrying wire
- 3.4 The simple electric motor (DC motor)
- 3.5 The electric generator
- 3.6 Summary of Lesson 3
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Question bank: Unit 2 — Electricity and Magnetism
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Unit 3 — Variation of Traits in Living Organisms
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Question bank: Unit 3 — Variation of Traits in Living Organisms
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Unit 4 — Dating Planet Earth
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Question bank: Unit 4 — Dating Planet Earth
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Science — Third Preparatory 2026/2027
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Unit 1 - Force, Motion, Acceleration and Physical Quantities
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Text lesson
Unit 2 — Electricity and Magnetism
Unit 2 — Electricity and Magnetism
1.8 Summary of Lesson 1
1.8 Summary of Lesson 1
- Current = ordered flow of charge; I = Q/t; ampere = coulomb/second; ammeter in series.
- Potential difference V = W/Q; volt = joule/coulomb; voltmeter in parallel.
- emf is the total work per coulomb by the source in the whole circuit; ε is greater than terminal voltage because of internal resistance.
- Cells in series add emf; cells in parallel keep the emf of one cell.
- Resistance opposes current; increases with length and resistivity and decreases with area.
Unit 2 — Electricity and Magnetism · 9 / 20