2 Answers

Lamps in domestic lightings are usually in…

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PHYSICS

Lamps in domestic lightings are usually in

  • A. Series
  • B. Divergent
  • C. Convergent
  • D. Parallel

QUICK ANSWER…

D

DETAILS…

Lamps in domestic lightings are usually arranged in parallel, let me explain…

Series connection is one in which one terminal of one lamp is connected to one terminal of the next lamp and the two final ends connected to a power source. In this kind of connection, fault in one bulb would affect the entire circuit.

Parallel connection is one in which one terminal from each of the bulbs are connected together to one side of the power source, and all the other terminals of the bulbs are connected together to the other side of the power source. In this kind of connection, fault in one bulb will not affect the functionality of others.

There is also a second reason, effective resistance in series is usually higher than that in parallel, this implies that connecting the lamps in parallel will result in less load on the circuit.

Now for the right answer to the above question:

  1. Option A is incorrect. series connection is not encouraged because when one of the bulbs dies, the circuit will be broken and other bulbs will not function.
  2. Option B is incorrect.
  3. C is incorrect.
  4. D is the correct answer.

KEY-POINTS…

You may please note these/this:

  • In series connection, the functionality of any bulb depends on that of other bulbs.
  • But in parallel connection, each bulb functions independent on the state of the other, this is why this kind of connection is featured in home lightings.
  • Effective resistance in parallel is less than in series, hence if the lamps are connected in parallel, less load will be exacted on the circuit, and less power will be consumed, this is a second reason.

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/ culled from 2019 JAMB-UTME physics question 8 /

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