AExE01 · Chapter 1Basic Electrical & Electronics🏛️ Past Licensure QuestionID: 521e0f83
If two light bulbs are connected in series and one burns out (opens), what happens to the second bulb?
If two light bulbs are connected in series and one burns out (opens), what happens to the second bulb?
Multiple Choice Options
- A
The other bulb continues to glow with the same brightness
- B✓ Correct Option
The other bulb stops glowing
- C
The other bulb glows with increased brightness
- D
The other bulb also burns out
Detailed Technical Solution & Explanation
When two bulbs are wired in series, their filaments form a single continuous conductive loop. If one bulb blows out, its filament melts and physically opens the circuit (), dropping the circuit current to zero and causing the second bulb to immediately extinguish.
Option Analysis:
•
Option A (The other bulb continues to glow with...): Incorrect. True only for parallel connections, not series.
•
Option B (The other bulb stops glowing): Correct. Opening a series circuit stops current everywhere in the branch.
•
Option C (The other bulb glows with increased b...): Incorrect. Occurs only if a bulb is short-circuited, not blown open.
•
Option D (The other bulb also burns out): Incorrect. The second bulb remains intact because current drops to zero.
Reference: Mock Test 04NEC Licensure Syllabus