What is an ohmic resistor ? Give one example of an ohmic resistor. Draw a graph to show its currentvoltage relationship. How is the resistance of the resistor determined from this graph ?

What is a non-ohmic resistor ?

How can you find the resistance of the resistor from this graph?

What are resistors? Give some examples.

If the potential difference applied across a variable resistor is constant, draw a graph between the current in the resistor and the resistance.

A body falls freely from a certain height. Show graphically the relation between the distance fallen and square of time. How will you determine g from this graph ?

A cell of e.m.f. 'E' and internal resistance 'r' is connected across a variable resistor 'R'. Plot a graph showing the variation of terminal potential 'V' with resistance R. Predict from the graph the condition under which 'V' becomes equal of 'E'

Fig. 2.42 given below shows a velocity-time graph for a car starting from rest. The graph has three parts AB, BC and CD. (i) State how is the distance travelled in any part determined from this graph. (ii) Compare the distance travelled in part BC with the distance travelled in part AB. (iii) Which part of graph shows motion with uniform (a) velocity (b) acceleration (c) retardation ? (iv) (a) Is the magnitude of acceleration higher or lower than that of retardation ? Give a reason. (b) Compare the magnitude of acceleration and retardation.

Give two differences between an ohmic and non ohmic resistor.

The figure shows a graph of the current in a charging circuit of a capacitor through a resistor of resistance 10Omega .

While stud dying the dependence of potential difference (V) across a resistor on the current (I) passing through it, in order to determine the resistance of the resistor, a student took 5 readings for different values of current and plotted a graph between V and I. He got a straight line graph passing through the origin. What does the straight line signify? Write the method of determining resistance of the resistor using this graph.