The I-V characteristics of a resistor are observed to deviate from a staight line for higher values of current.Why??

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Solution

The I-V characteristics of a resistor are observed to deviate from a straight line for higher values of current because at higher value of current resistance of the conductor get changed due to increase in temperature. This means current is not exactly proportional to the voltage.

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Similar questions

The graph of potential difference (V) versus current (I) for an ohmic resistor is a straight line as shown below:

The resistance of the resistor can be determined from this graph as:

The values of current I flowing in a given resistor for the corresponding values of potential difference V across the resistor are given below −

I (amperes )	0.5	1.0	2.0	3.0	4.0
V (volts)	1.6	3.4	6.7	10.2	13.2

Plot a graph between V and I and calculate the resistance of that resistor.

\begin{matrix} V (volts) & 0.5 & 1.0 & 1.5 & 2.0 & 2.5 & 3.0 & 4.0 & 5.0 I (amperes) & 0.1 & 0.2 & 0.3 & 0.4 & 0.5 & 0.6 & 0.8 & 1.0 \end{matrix}

I

A C

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