Advanced Science Primary 5 Systems

A circuit has three identical bulbs (B1, B2, B3) in series with two batteries. If Bulb B2 fuses, what happens to the brightness of Bulb B1 and B3?

A Only B1 remains lit while B3 goes out.
B B1 and B3 become dimmer.
C B1 and B3 become brighter.
D B1 and B3 both go out.
Show Worked Solution

Worked Solution

Step 1: In a series circuit, there is only one path for current. Step [2-9]: If any component (B2) fuses, the path is broken (open circuit). Step [2-9]: Current stops flowing throughout the entire loop. Step [2-9]: All other bulbs (B1 and B3) go out.

Correct answer: B1 and B3 both go out.

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