Question

The following table shows current in Amperes and potential difference in Volts. 
Which law will the graph prove? Explain the law.

Answer 1

The graph proves Ohm's law. Ohm's law states that, under constant temperature and physical conditions, the current flowing through a conductor is always proportional to the potential difference across it i.e.
V ∝ I
Or , V = RI
where R is a constant of proportionality called resistance of the resistor. It tends to resist the flow of charge through a conducting wire. Its SI unit is ohm (Ω).