Experiment #1
Measurement of Resistance
• Each student will be given a package of
resistors.
• For each resistor,
– Determine the expected value of resistance by
applying the color code (shown on page 3).
– Measure the actual value of the resistance by using
the ohmmeter function on the Digital Multimeter.
– Compare the actual and expected values of
resistance – does the actual value fall within the
allowable range?
– Enter your results in an EXCEL table, as shown on
the next page.
1
Data for Resistance Experiment #1
Name:
ITEM #
NOMINAL
VALUE
TOLERANCE
ALLOWABLE
RANGE
MEASURED
VALUE
VARIATION
(in %)
1
2
3
4
5
6
7
8
9
10
Eg: 450-510 Ohms
100*(Meas-Nom)/Nom
Determined from color band code
2
Resistor Color Band Code
Band 1 (closest to the end) – first
digit
Band 2 – second digit
Band 3 – power of ten multiplier
(most cases simply the number of
zeros)
Band 4 – tolerance (Red = 2%, Gold
= 5%, Silver = 10%, none = 20%)
Color
Value
Color
Value
Black
Brown
Red
Orange
Yellow
0
1
2
3
4
Green
Blue
Violet
Gray
White
5
6
7
8
9
3