Q5 of 11 Page 44

Match the pairs


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3

Umesh has two bulbs having resistances of and He wants to connect them in a circuit, but if he connects them one at a time the filament gets burnt. Answer the following.

A. Which method should he use to connect the bulbs?


B. What are the characteristics of this way of connecting the bulbs depending on the answer of A above?


C. What will be the effective resistance in the above circuit?

4

The following table shows current in Amperes and potential difference in Volts.

A. Find the average resistance.


B. What will be the nature of the graph between the current and potential difference? (Do not draw a graph.)


C. Which law will the graph prove?


 6

The resistance of a conductor of length x is r. If its area of cross section is a, what is its resistivity? What is its unit?

 7

Resistances and are connected as shown in the figure. S1 and S2 are two keys. Discuss the current flowing in the circuit in the following cases.


A. Both and are closed.


B. Both and are open.


C. is closed but is open