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(a) What is the ratio of potential diffe...

(a) What is the ratio of potential difference and current known as?
(b) The values of potential difference V applied across a resistor and the corresponding values of current I flowing in the resistor are given below:
`{:("Potential difference"V("in volts"),:,2.5,5.0,10.0,15.0,20.0,25.0),("Current,I"("in amperes"),:,0.1,0.2,0.4,0.6,0.8,1.0):}`
Plot a graph between V and I, and calculate the resistance of the resistor.
(c) Name the law which is illustrated by the above V-I graph.
(d) Write down the formula which states the relations between potential difference, current and resistance.
(d) The potential difference between the terminals of an electric iron is 240V and the current is 5.0A. What is the resistance of the electric iron?

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