Lesson 11 of 15
Why a lamp may stay dark
Show on a big screenThe switch looks closed. The cell is in. The lamp stays dark.
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The idea
Step 1 of 5
- A loop with a dark lamp.
- Is the switch really closed?
- Is the filament broken?
- Is the cell worn out?
- Do the wire ends touch the terminals?
A lamp with a broken filament is fused. A fused lamp leaves a gap in the loop. A wire end still covered with plastic cannot let current through. Plastic is an insulator.
A dark lamp has a reason. Check the switch, the lamp, the cell and the wire ends.
An adult stays with you for every circuit.
Try the lab to finish this lesson.