In the circuit diagram above, which lamp causes the other to go off?
Attached Figure / Diagram
A
P
B
Q
C
R
D
S
Verified Correct Answer: D.
Physical Principles & Numerical Solution
If lamp S goes off, all other lamps will go off. This is because lamp S is required to complete the whole circuit.
Source: WAEC / JAMB / NECO Classroom Archive (Record #72049)