Ohm's Law

Ohm's Law

Experimental Procedure

We will use Ohm's Law Experiment lab report (PASCO, p. 9), see the link below.

1. Build a simple circuit as shown in the diagram below and pictures to the right.

2. Change the resistor and read the current.

Attention: create the circuit in such a way that you can easily replace the resistor without disconnecting the current probe.

3. Repeat for all the resistors that you find with your electric board. If you have your notes, you can use the resistors table from one of the previous labs. Otherwise, find out the resistance using color-coded bands on the resistors.

• Since there are not enough small-value resistors, you may want to use your skills of connecting resistors in series and parallel to get the equivalent resistance of the desired value.

4. Write down your findings in a table (will be provided in the lab)

5. Plot the current as a function of resistance I = I(R) using your data. Graph the results.

• Label the axis "I [A]" and R [Ω]". (Unfortunately, the sample graph does not have good labels)

• Adjust the axis so the graph is nicely stretched and the relation between measured quantities visible

• Plot the best-fit line

• How is volage represented in this graph?

Sample graph:

The vertical axis shows the current [milliamps] plotted against the resistance [ohm].