Advanced Science Primary 5 Systems

In the circuit below, Bulb B1 is in series with a parallel arrangement of Bulb B2 and Bulb B3. If Bulb B2 fuses, what happens to the other bulbs?

A B1 and B3 both go out.
B B1 and B3 both stay lit.
C B1 stays lit but B3 goes out.
D B1 and B3 become dimmer.
Show Worked Solution

Worked Solution

Step 1: The circuit has a main path (B1) and two parallel branches (B2, B3). Step 2: If B2 fuses, that specific branch is open, but a closed loop still exists through B1 and B3. Step 3: Therefore, current can still flow through B1 and B3.

Correct answer: B1 and B3 both stay lit.

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