Data Sheet

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168. Resistor Tolerance
Build the circuit shown on the left and turn on the switch (62). Press the
press switch (61) and you will see the heart LED (69) and colorful LED (72)
light. Release the press switch (61) and the heart LED (69) and colorful LED
(72) will stay bright for a little while and then turn dim. In project #128 the
4-band resistor was discussed. The 4th band on the right represents the
tolerance of the resistor. Tolerance is specied in percentage and means
that the actual resistor value will be within the dened tolerance percentage
of the value dened by the rst three bands on the left of the resistor. The
most common color codes for tolerance are Red = 2%, Silver = 5% and Gold
= 10%. For example, if the 1kW resistor (42) in this circuit had a 4th band
that was red, then the actual resistance of the resistor could be anywhere
from 0.98*1,000 = 980W to 1.02*1,000 = 1020W.
169. 5.1kW Resistor Tolerance – Red Band
Replace the 1kW resistor (42) in project #168 with the 5.1kW resistor (43)
and turn on the switch (62). Press the press switch (61) and you will see
the heart LED (69) and colorful LED (72) light. Release the press switch (61)
and the heart LED (69) and colorful LED (72) will stay bright for a while and
then turn dim. If we had a 5.1kW resistor with a 4th band that is red, then
this would mean that the actual resistance of the resistor could be anywhere
from 0.98*5,100 = 4,998W to 1.02*5,100 = 5,202W.
170. 10kW Resistor Tolerance – Red Band
Replace the 1kW resistor (42) in project #168 with the 10kW resistor (44)
and then turn on the switch (62). Press the press switch (61) and you will
see the heart LED (69) and colorful LED (72) light. Release the press switch
(61) and the heart LED (69) and colorful LED (72) will stay bright for several
seconds and then turn dim. If we had a 10kW resistor with a 4th band that
is red, then this would mean that the actual resistance of the resistor could
be anywhere from 0.98*10,000 = 9,800W to 1.02*10,000 = 10,200W.
171. 100kW Resistor Tolerance – Red Band
Replace the 1kW resistor (42) in project #168 with the 100kW resistor
(45) and then turn on the switch (62). Press the press switch (61) and you
will see the heart LED (69) and colorful LED (72) light. Release the press
switch (61) and the heart LED (69) and colorful LED (72) will stay bright for
a long time before turning dim. If we had a 100kW resistor with a 4th band
that is red, then this would mean that the actual resistance of the resistor
could be anywhere from 0.98*100,000 = 98,000W to 1.02*100,000 =
102,000W.
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