Question

The graph between potential difference and current for a conductor is a straight line passing through the origin. Which law is illustrated by such a graph?

• A. Law ofcombination of resistances
• B. Henry's law
• C. Ohm'slaw
• D. Joule's law ofheating

Answer 1

The correct option is C Ohm'slaw

Answer is C.
Ohm's law states that the current through a conductor between two points is directly proportional to the potential difference across the two points. Introducing the constant of proportionality, the resistance, we arrive at the usual mathematical equation that describes this relationship:
$I=\frac{V}{R}$,
where I is the current through the conductor in units of amperes, V is the potential difference measured across the conductor in units of volts, and R is the resistance of the conductor in units of ohms. More specifically, Ohm's law states that the R in this relation is constant, independent of the current.
Hence, the graph between potential difference and current for a conductor is a straight line passing through the origin is illustrated in Ohm's law.