Laboratory Exercise Basic Electrical Calculations Page 3
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Does the calculated value of V
closely match your value for V
? ________
TOTAL
IN
Assume that the previous circuit is altered to match the schematic diagram of Figure 2
below with a pair of 4700 Ω resistors in parallel. Calculate the equivalent resistance of
these two resistors in parallel.
R
= 1 / (1/R3 + 1/R4) = _______________
Parallel
R1
1500
R2
V
IN
3000
10 V
R3
R4
4700
4700
Figure 2: Series-Parallel Circuit
Is the equivalent resistance of R3 and R4 greater or less than the resistance of R3 alone?
__________ .
What effect will the parallel combination have on total circuit current? (will the circuit current
be greater or less than the previous circuit current?)
________________
Why?
Table of Resistor Color Codes
Band 5
Band 3
Band 4
Color
Abbr.
Band 1
Band 2
(Reliability)
(Multiplier)
(Tolerance)
(if present)
Black
Bk
0
0
0 = 1
Brown
Br
1
1
1 = 10
1%
Red
R
2
2
2 = 100
0.1%
Orange
O
3
3
3 = 1000
0.01%
Yellow
Y
4
4
4 = 10000
0.001%
Green
Gn
5
5
5 = 100000
Blue
Bl
6
6
6 = 1000000
Violet
V
7
7
7 = 10000000
Gray
Gy
8
8
White
W
9
9
Gold
Go
5%
Silver
S
10%
No Color
20%
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