Question

linh builds a circuit from the diagram shown. if linh removes bulb 3, which bulbs will remain lit? 1 only 1 and 2 only 4 only 1, 2, and 4

Explanation:

Step1: Analyze the circuit type

Bulbs 1 and 3 are in parallel. Bulbs 1 - 3 (as a parallel combination) and bulb 2 are in series. This series combination (1 - 3 - 2) and bulb 4 are in parallel.

Step2: Effect of removing bulb 3

When bulb 3 is removed, the parallel path with bulb 3 is broken. But the path with bulb 1 is still intact. Since bulb 1 and 2 are in series (in the upper branch), current can flow through 1 and 2. Also, bulb 4 is in a separate parallel branch. So current can flow through 4 as well.

Answer:

1, 2, and 4