School learnersTest and diagnoseExample · 1 question · 2 min

Circuit Repair Lab

Trace a broken circuit, test one change, and explain why the lamp stays dark.

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Which change closes the path and lets current reach the lamp?

Add a second battery without repairing the open path.Reconnect the loose cable between the switch and the lamp.

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Trace the path from one battery terminal all the way back to the other. Find the gap before changing the source.

About this activity

What you practise: Diagnose a system by tracing relationships, testing a repair, and explaining why the repair changes the result.

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Which change closes the path and lets current reach the lamp? The circuit shows a 9 V battery, a switch in the closed position, a lamp that is off, and a cable with a gap between the switch and the lamp. The 9 V source and closed switch cannot drive current through a gap. Bridging the loose cable creates one continuous path from one battery terminal, through the switch and lamp, back to the other terminal.