Study the mixed circuit diagram below. Switch S1 is closed while Switch S2 is left open. Which bulb(s) will light up?
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Worked Solution
Step 1: Switch S1 is on the main series path. Because it is closed, current can flow from the battery to the parallel branches.
Step 2: The top branch with Bulb B1 has no open switches, so it forms a closed circuit. B1 lights up.
Step 3: The bottom branch has Switch S2, which is open. Current cannot flow through B2.
Step 4: Therefore, only B1 lights up.
Correct answer: Bulb B1 only
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