Q27 of 27 Page 1

The values of current (I) flowing through a given resistor of resistance (R), for the corresponding values of potential difference (V) across the resistor are as given below:


Plot a graph between current (I) and potential difference (V) and determine the resistance (R) of the resistor.


According to the Ohm’s law the current generated through a conductor is directly proportional to the potential difference or voltage applied across the conductor. It can be described with following mathematical expression,



The above equation can be rearranged into,



The question has provided with a table that show the values of current I through a resistor R for different values of voltage V.


Graph :



Since, the value of the resistor is the slope of the V-I graph, which is equal to 5Ω


More from this chapter

All 27 →
23

What is observed when a solution of sodium sulphate is added to a solution of barium chloride taken in a test tube? Write equation for the chemical reaction involved and name the type of reaction in this case.

 24

List the steps of preparation of temporary mount of a leaf peel to observe stomata.

 25

Name the process by which an amoeba reproduces. Draw the various stages of its reproduction in a proper sequence.

OR


A student is viewing under a microscope a permanent slide showing various stages of asexual reproduction by budding in yeast. Draw diagrams of what he observes.(in proper sequence)


 26

An object of height 4.0 cm is placed at a distance of 30 cm from the optical centre‘O’ of a convex lens of focal length 20 cm. Draw a ray diagram to find the position and size of the image formed. Mark optical centre ‘O’ and principal focus ‘F’ on the diagram. Also find the approximate ratio of size of the image to the size of the object.