Question

In an experiment of verification of Ohm's law, following observations are obtained:

Potential difference V (in volt)	0.5	1.0	1.5	2.0	2.5
Current I (in ampere)	0.2	0.4	0.6	0.8	1.0

What will be the potential difference V when the current I is 0.5 A ?

• A. $1.25V.$
• B. $0.5V$
• C. $2V$
• D. $1V$

Answer 1

The correct option is A $1.25V.$

A currentvoltage characteristic or IV curve (currentvoltage curve) is a relationship, typically represented as a chart or graph, between the electric current through a circuit, device, or material, and the corresponding voltage, or potential difference across it.
In the graph, the voltage is plotted along the y-axis and the current is plotted along the x-axis. Hence, the value of potential difference for the current of 0.5 amps along the x-axis can be directly found out from the y-axis. The line intersecting the point along the y-axis gives the corresponding potential difference.
Therefore, for 0.5 amps the potential difference is 1.25 V.