Lesson 0 of 14
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Show on a big screenA torch bulb feels warm after a while. A compass near a wire can move. One thing causes both: electric current, the flow of electricity.
This track covers the heating and magnetic effects of current. It also covers cells. All of it is in Chapter 4, Electricity: Magnetic and Heating Effects.
What this track covers
- A wire warms up. Current warms any ordinary wire.
- Heat put to work. A heater uses that warmth on purpose.
- A wire made to fail. A right-sized fuse melts first.
- A wire becomes a magnet. A compass shows it.
- More turns, more pull. A coil can be made stronger.
- A magnet you can switch off. The electromagnet.
- A bell that rings itself. An electromagnet at work.
- Two metals and a liquid. How a simple cell makes current.
- Cells that run down. Dry cells, rechargeable cells and used cells.
Quick catch-up
- Class 7: a circuit needs a closed loop. A switch opens or closes it.
- Class 6: a magnet pulls iron and steel. A compass needle is a small magnet.
Safety
Every bench here is a simulation. Try real activities only with a teacher beside you. Never join the two ends of a cell with a wire.