NCERT - Science

Book: NCERT - Science

Chapter: 12. Electricity

Subject: Physics - Class 10th

Q. No. 5 of In Text Questions-Pg-216

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5

What is (a) the highest, and (b) the lowest, total resistance that can be secured by the combination of four coils of resistances 4, 8, 12 and 24?

(a) The highest resistance can be secured (or obtained) by connecting all the four coils in series. In this case:

R = R1 + R2 + R3 + R4


R = 4 + 8 + 12 + 24


R = 48


Thus, the highest resistance which can be secured is 48 ohms.


(b) The lowest resistance can be secured by connecting all the four coils in parallel. In this case:



Thus, the lowest resistance which can be secured is 2


5

Chapter Exercises

In Text Questions-Pg-200
In Text Questions-Pg-202
In Text Questions-Pg-209
In Text Questions-Pg-213
In Text Questions-Pg-216
In Text Questions-Pg-218
Exercise-Pg-221

More Exercise Questions

1

Judge the equivalent resistance when the following are connected in parallel:

(a) 1 and 106


(b) 1,103and 106
2

An electric lamp of 100, a toaster of resistance 50 , and a water filter of resistance 500 are connected in parallel to a 220 V source. What is the resistance of an electric iron connected to the same source that takes as much current as all three appliances, and what is the current through it?
3

What are the advantages of connecting electrical devices in parallel with the battery instead of connecting them in series?
4

How can three resistors of resistances 2, 3, and 6 be connected to give a total resistance of

(a) 4, and (b) 1 ?
5

What is (a) the highest, and (b) the lowest, total resistance that can be secured by the combination of four coils of resistances 4, 8, 12 and 24?