ZIMSEC · Form 4 · Syllabus 4023
Physics
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- Waves, sound and light Waves transfer energy without transferring matter.
- Electricity: circuits and Ohm's law P = VI = I²R. Energy = Pt. Electricity is sold in kilowatt-hours (kWh).
- Magnetism and electromagnetism Like poles repel; unlike poles attract. Field lines go from north to south. Iron is easily magnetised and demagnetised (soft); steel keeps its magnetism (hard), so it is used for permanent magnets.
- Atomic physics and radioactivity Protons and neutrons in the nucleus; electrons outside. Some nuclei are unstable and decay, giving out radiation randomly.