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 current I when the potential difference V is 0.75 V ?

• A. $0.5A$
• B. $0.3A$
• C. $0.75A$
• D. $0.6A$

Answer 1

The correct option is B $0.3A$

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 current for the potential difference of 0.75 V along the y-axis can be directly found out from the x-axis. The line intersecting the point along the x-axis gives the corresponding value of current.
Therefore, for 0.75 Voltage the current is 0.3 amps.