Lab 7 Ohm’s law
Associated videos: Ohm’ s law and How to connect the six resistors
Goal
To measure voltage across resistors in series. To use Ohm’s law.
Activity
part 1
Build the connections with one resistor only. Use the 1kOhm resistor. Use 3.3 Volts.
Measure the voltage across the resistor with the multimeter.
Kit voltage value:
Measured value:
% difference:
part 2
a) Connect all resistors in series. Built the connections with 6 resistors (use 1kOhm, 2kOhm, 5.1kOhm combinations). Measure the voltages across each one of them, and across two or three of them.
Since the resistors are all in series, the current drawn from the power source is the same for all of them.
b) On the usual spreadsheet, build a table similar to the table below with the resistance and the voltages. Measure in total at least 9 data points.
c) Use your data to build a chart with Voltages vs. Resistances.
d) Build the line of best fit. What is the slope equal to? Ask to show the equation.
e) On the spreadsheet, include a row with the calculations to find the equivalent resistance for the six resistors in series and the total current.
f) Compare the value of the total current found on part (e) with the slope from the plot. %error.