Science Class 8
Electricity: Magnetic and Heating Effects
How electricity warms a wire, makes a switchable magnet, and how cells work.
14 lessons · ~74 min total
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Lessons in this topic
- 0 Start here A roadmap: how current warms a wire, makes a magnet, and where cells get it. · 3 min You are here
- 1 A wire warms up A wire carrying current warms up. Some wires warm far more than others. · 6 min
- 2 Heat put to work Heaters, irons and kettles use the heating effect on purpose. In other things it is a side effect. · 6 min
- 3 A wire made to fail A fuse is a thin wire that melts first, so that nothing else gets damaged. · 6 min
- 4 A wire becomes a magnet A wire with current in it acts like a magnet. A compass shows it. · 6 min
- 5 More turns, more pull More cells, more turns and an iron core make a coil pull harder. · 6 min
- 6 A magnet you can switch off An electromagnet is a magnet only while current flows. That makes it useful. · 6 min
- 7 A bell that rings itself An electric bell uses an electromagnet that breaks its own circuit and makes it again. · 6 min
- 8 Checkpoint: what current does Five quick checks on warming, fuses, magnets and coils. · 4 min
- 9 Two metals and a liquid A cell makes current from two different metals dipped in a liquid. · 6 min
- 10 Cells that run down A dry cell cannot be charged. A rechargeable cell can be charged and used again. · 6 min
- 11 Checkpoint: cells Four quick checks on electrodes, electrolytes and kinds of cell. · 3 min
- 12 The big picture Nine ideas about electric current and the cells behind it, on one screen. · 4 min
- 13 Track quiz The nine rules the labs use, then one question on each idea. · 6 min
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