Question

The values of current (I) flowing through a given resistor of resistance (R), for the corresponding values of potential difference (V) across the resistor are given below :

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

Plot a graph between current (I) and potential difference (V) and determine the resistance (R) of the resistor.

Answer 1

We know that, V= IR

From the graph.
$V=0.5V$

$I=0.1A$

Substituting on the equation $V=I\times R$
$0.5=0.1\times R$

$\frac{0.5}{0.1}=R$

$R=5\Omega$