Science Class 7
Electricity: Circuits and their Components
What a bulb needs to glow: an unbroken loop, a switch, and materials that let it through.
15 lessons · ~73 min total
Track progress — 0 of 15 lessons read 0%
Lessons in this topic
- 0 Start here A torch will not light. Is it the lamp, the cell or the loop? · 3 min You are here
- 1 The loop has to be unbroken The lamp glows only when the path is closed, with no gap. · 5 min
- 2 A switch is a gap you can close A switch opens or closes the gap. ON is closed. OFF is open. · 5 min
- 3 Some things let the loop through A conductor lets electric current through. An insulator does not. · 6 min
- 4 A drawing everyone reads the same way Every part has a symbol. A drawing made of symbols is a circuit diagram. · 5 min
- 5 Two or more cells make a battery Cells joined + to − make a battery. Two cells turned against each other cancel. · 6 min
- 6 One loop, one break, everything stops Parts in one loop share one path. Take one out and every lamp goes dark. · 5 min
- 7 Cells are for experiments Use only cells. Keep hands dry. Never use a damaged wire. · 5 min
- 8 Checkpoint: loops, switches, parts and safety A quick graded check on the first seven ideas. · 4 min
- 9 An LED has a right way round An LED lets current through one way only. Its long leg is +. · 5 min
- 10 Two kinds of electricity A cell gives DC, which flows one way. A socket gives AC. · 5 min
- 11 Why a lamp may stay dark A dark lamp has a reason. Check four parts in turn. · 5 min
- 12 Checkpoint: LEDs, kinds of current and faults A quick graded check on LEDs, DC and AC, and faults. · 4 min
- 13 The big picture The whole chapter on one screen. A gap stops the lamp. · 4 min
- 14 Track quiz A cheat-sheet of the rules, then one question per idea. · 6 min
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