Give a long answer to the question given below.
 
a. Express Ohm’s law.

b. The graph between potential difference and current is shown. What does the slope of this graph indicate? Define the quantity and find its SI value using the graph.

c. Obtain the mathematical relation between \(1\ kWh\) and \(1\ joule\).
 
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a.  Ohm's law states that, at a constant temperature, the steady current '\(I\)' flowing through a conductor is to the potential difference '\(V\)' between the two ends of the conductor.
 
Ohm's law states that .
 
b. The slope of V-I graph gives the of the conductor. 
 
From the graph, we can see that the slope of the line is equal to
 
c. 1 kWh is equal to .