Prof. Rich Kozick
January 29, 1998
Kirchhoff's Laws, Resistors, and the Votage Divider
In this lab session,
you will have the opportunity to work through electronic lessons
on Kirchhoff's laws and resistance.
You will also set up some simple circuits and take measurements.
Although the electronic lessons repeat the material from
class and the text, seeing the concepts in a different form
should help increase your understanding.
- If you did not have your power supply for
Lab 1, please measure the voltage
between the various wires on your power supply.
Determine which wires correspond to +12 V, -12 V, +5 V, and Ground.
Record the results in your lab notebook for future reference.
- Perform the electronic lessons listed below using the
Exploring Electrical Engineering program
on the PC at your lab bench.
Record results in your lab notebook as follows.
If the lesson asks you a question based on the reading in the
lesson, then nothing needs to be recorded in your notebook.
(But feel free to take notes if you would like.)
For all of the experimental activities in which
you take a measurement or set up a circuit,
describe the activity in your notebook and record your results.
The following lessons are under the Basic Concepts menu.
In each lesson, please answer all of the questions,
do all of the activities, and show your results to the
lab instructor or lab assistant when requested in the lesson.
- Please finish the lesson on Measuring Voltage that you
began last week.
Set up the circuits that are requested and make the requested
- Do the lesson on Measuring Resistance.
You can skip the exercise that uses the pencil - that will be
done in a later lesson.
- Do the lessons on Resistors
(there are three lessons)
Sources (one lesson on ideal sources).
These are located under the Elements menu item.
- Do the lessons on
Kirchhoff's Current Law and
Kirchhoff's Voltage Law.
Do the quizzes at the end, and show the instructor your results.
- Set up the "voltage divider" circuit shown below
using your protoboard and power supply.
Choose two different values for the resistors, and choose
the resistors so that the current drawn from the power supply
is no greater than approximately 10 mA.
Measure the voltage drop across each resistor, and compare
your measured value with the value computed by the formulas.
[CIRCUIT DIAGRAM AND FORMULAS ARE NOT AVAILABLE IN HTML DOCUMENT.]