Standard Science Primary 5 Systems

In the circuit shown, which switch(es) must be closed for only Bulb B2 to light up?

A S1 only
B S1 and S3
C S1 and S2
D S2 only
Show Worked Solution

Worked Solution

Step 1: S1 is the main switch next to the battery. Step [2-9]: B2 is in a parallel branch with switch S2. Step [2-9]: Both S1 and S2 must be closed to complete the path for B2.

Correct answer: S1 and S2

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