University of Florida
— Summer 2011
Drs. E. M. Schwartz & R. Srivastava
Ode Ojowu, TA
Lab 0: Introduction to Circuits Laboratory
To gain skills in using basic electrical laboratory equipment such as meters and power supplies.
(These skills will be needed in subsequent electrical engineering laboratories and in industry.)
To become familiar with and be able to use a breadboard and the LabVIEW ELVIS equipment (on
which the lab breadboard sits).
To learn the resistor color code to determine radial resistor values.
To learn how resistor combine in series and in parallel.
To learn the limits of the operation of components and equipment.
To learn to record data and report experimental results, i.e., to effectively communicate what you
have done and observed.
To gain self-confidence in your capabilities in an electrical laboratory.
To become safety conscious in a laboratory environment.
Printouts (required) of the below documents:
The lab assignment (this document), Lab Rules and Policies, Lab Safety, Parts List, Intro to
A plastic bag will be given to you in lab containing all the parts on your parts list.
A breadboard and a wire kit will also be given to you in lab.
A myDAQ (a measurement and control device) with a DVD with myDAQ software, ELVIS
software, and MultiSim will be given to you in lab AFTER you have registered at the following
Use “Senior Design” for the course.
Resistance and Color Codes
Unit of Resistance
The SI unit of resistance is the Ohm, and the unit symbol is the capital Greek letter omega
prefixes are used for writing convenience.
For example, the prefixes k and M represent 10
is written as 33 k
(33 kilo-ohms), and 1,200,000
as 1.2 M
Resistance Nominal Values and Tolerances
Resistor manufacturers print resistance values on resistor casings either in numerical form or in a color
These values are only
They are only approximately equal to the actual
The possible percentage variation of resistance about the nominal value is called the
The popular carbon-composition resistors have tolerances of
percent, which means that the actual resistances can vary from the nominal values by as much as
of the nominal values.
The most popular resistance color code has nominal resistance values and tolerances indicated by the
colors of either three or four bands around the resistor casing, as shown in Fig. 1.
(Sometimes there is a
fifth band, not considered here, for failure rate.) The colors of the first and second bands correspond,
respectively, to the first two digits of the nominal resistance.
The first digit is never a zero.
The color of