These are designed to cut through the clutter. We focus only on what you need for exams: definitions, formulas, calculations, and the differences between concepts.
Electricity is generated when a wire or a magnet moves, cutting through magnetic field lines—a process known as . Science Form 3 Chapter 6 Short Notes
Lina combined all her knowledge. She built a (electricity → movement) to spin a magnet near a coil. This induced a current that recharged her battery. Her lantern now stayed bright forever. These are designed to cut through the clutter
The lantern worked, but it was dim. Lina wrapped a copper wire around the rusty iron nail and connected it to a battery. Suddenly, the nail could pick up other nails! Lina combined all her knowledge
| Source | Renewable? | Advantage | Disadvantage | | :--- | :--- | :--- | :--- | | (Dam) | Yes | No pollution, low cost after building | Destroys habitats (floods forest) | | Thermal (Coal/Gas) | No | High power output | Air pollution, global warming | | Nuclear | No (Uranium is finite) | Very high output, no air pollution | Radioactive waste, risk of meltdown | | Solar | Yes | Silent, no fuel cost | Only works during day, large area needed | | Wind | Yes | No pollution | Noisy, kills birds, only windy areas | | Biomass | Yes | Uses waste materials | Requires large land to grow fuel |
