It is preferable to connect bulbs in series or in parallel?

Question

Examoogle · Accepted Answer

Option B: Parallel

Explanation & Concepts:
It is preferable to connect bulbs in parallel because it ensures each bulb receives the full rated supply voltage, independent of other bulbs in the circuit. In a parallel circuit, if one bulb fails, the remaining bulbs continue to operate as the continuity of the other branches remains unaffected.

Working Principle: In a parallel configuration, the potential difference across each branch is identical to the source voltage ($V_{parallel} = V_1 = V_2 = V_n$). Since bulbs are rated for specific voltages, parallel connection allows each to draw its design current ($I = P/V$). Conversely, in series, the voltage divides among the components, causing each bulb to glow dimmer than its rated capacity, and a single open-circuit failure disconnects the entire network.

Key Formulas: $V_{total} = V_1 = V_2 = V_n$ — Voltage in parallel; $I_{total} = I_1 + I_2 + I_n$ — Total current in parallel

Key Points: Constant voltage across all bulbs ensures uniform brightness.; Individual control is possible with separate switches.; Total circuit resistance decreases as more bulbs are added in parallel: $\frac{1}{R_{eq}} = \frac{1}{R_1} + \frac{1}{R_2} + ...$; A fault in one branch does not affect the operation of others.

Advantages: Each bulb receives full rated voltage.; Independent operation of each component.; Easy addition or removal of units without affecting others.

Disadvantages: Requires more wiring compared to series connections.; Total current consumption increases with each additional load.

Applications: Domestic wiring (lighting and appliances).; Commercial electrical distribution systems.

Additional Info: In series circuits, bulbs share the supply voltage, leading to a significant drop in power $P = V^2/R$ and dimming.. Option A is incorrect because it is rarely used for domestic lighting due to the dependency of load performance on other loads in the chain.

Answer: B is correct — Parallel circuits ensure that each bulb receives the full operating voltage and functions independently of other circuit elements.

Exam Tip: Remember: For power distribution, think 'Constant Voltage' (Parallel); for protection, think 'Current Limiting' (Series, e.g., Fuses).

Examoogle · Answer

Option A: Series

Examoogle · Answer

Option C: Both series and parallel

Examoogle · Answer

Option D: Neither series nor parallel

Feature	Series	Parallel
Voltage	Divides across loads	Same across all loads
Failure Effect	Entire circuit breaks	Only affected unit stops

Correct Answer

Discussion (0)

Correct Answer

Related Questions

Discussion (0)