Q10 of 19 Page 12

Why is parallel arrangement used in domestic wiring? ( CBSE 2008)

Using parallel arrangement in domestic wiring has many advantages:

1. Each electrical appliance will work under constant voltage because potential difference is same in parallel combination.


2. When two or more appliances are used at the same time, each appliance will be able to draw the current as needed.


3. When distribution circuits are in parallel, then each circuit operates separately. So, if one of the distribution circuits gets overloaded, only the fuse in that circuit will be blown off. And other distribution circuits will remain unaffected.

More from this chapter

All 19 →
8

a. Table gives the resistivity of three materials in (in Ω m) A, B, C.


Which one of them is the best conductor? And which is an insulator and why?


b. A wire of resistivity P is stretched to twice its length. What will be its new resistivity?

( CBSE 2012, 2011)

 9

Show how you would connect three resistors, each of resistance 6, so that the combination has a resistance of (i) 9, and (ii) 4 . ( CBSE 2011, 2009)

 12

Two electric bulbs A and B are marked 40 W – 220 V and 60 W – 220 V respectively. Which one of the two has a greater resistance? ( CBSE 2016)

 13

The potential difference between the terminals of an electric iron is 240 V and the current is 5.0 A. What is the resistance of the electric iron? ( CBSE 2016)