A student connected two bulbs in two different combinations as shown in figure A and B. Observe the figure and answer the following questions: a. Name the type of combination of the bulbs in figure A. b. Name the type of combination of the bulbs in figure B. c. State the combination in which the resistance will be decreased.

Foundation

Physics Foundation

Ohms Law and Resistance

Question

A student connected two bulbs in two different combinations as shown in figure A and B. Observe the figure and answer the following questions:
a. Name the type of combination of the bulbs in figure A.
b. Name the type of combination of the bulbs in figure B.
c. State the combination in which the resistance will be decreased.

LiveFree JEE Main Previous Year Online Papers Live Free JEE Advance Previous Year Online Papers

College PredictorLive

Know your College Admission Chances Based on your Rank/Percentile, Category and Home State.

Get your JEE Main Personalised Report with Top Predicted Colleges in JoSA

a. In figure A bulbs are connected as a series combination as they are connected one by one.
b. In figure B bulbs are connected as a parallel combination as they are connected across the same voltage.
c. In the parallel combination, the net resistance will be less.

Proof :

Let two identical resistances (R and R) are connected in series. Then the equivalent resistance will be R_s = R + R 2R

Now, let the resistances are connected in parallel. So, the equivalent resistance is

R_{p} = \frac{R \times R}{R + R} = \frac{R}{2}

So, it is clear that R_p < R_s.

Please subscribe our Youtube channel to unlock this solution.