Ohmic Conductor Experiment
An experiment was carried out where the effect on the current of changing the voltage through an unknown resistor was measured. The results were plotted on a graph, which is given below.
The line of best fit goes through the origin and the point (2.25, 9.6). The (2.25, 9.6) point is marked on the line using the red lines on the graph.
REMEMBER: The units on the bottom axis are mA which must be converted to A. This is done by multiplying the value by 1 × 10-3.
This gives us the x value as 2.25 × 10-3 A.
The theory for an ohmic conductor is that the potential difference (voltage) is directly porportional to the current. This is given by:
The gradient of the line is equivalent to the value of the resistor. Therefore calculating the gradient of the line will let us find out the value of the size of the resistor.
The resistor had a value of 4300 Ω