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Circuits Lab
The purpose of this lab is to theoretically estimate and
empirically measure current and voltage for a series circuit and a parallel
circuit. Your group has the following
materials to complete the lab: breadboard, resistors, 9V battery and leads,
multimeter, and jumper wires.
Lab Procedure
1.
Begin by measuring the voltage of your 9V
battery. Place the red lead on the “+”
side of the battery and the black lead on the “–“ side of the battery and note
the measurement as VDC.
2.
Identify the resistance values of the resistors
you’ve been given by using the Resistor tables below. On your lab, note the value of the resistor
you used for R1, R2, and R3.
3.
Measure the voltage drop across each
resistor. V1 corresponds to
the voltage drop across R1, and so on. Record the voltages for both the series and
parallel circuits as the experimental values.
4.
Calculate the current. In the series circuit, you will only have to calculate
I. In the parallel circuit, you will
need to calculate I1, I2, and I3. Record the currents for both the series and
parallel circuits as the experimental values.
5.
Using the values you obtained for VDC,
R1, R2, and R3, calculate the theoretical
values for the voltages.
6.
Calculate the percent error for the voltages and currents. Percent error is calculated as:
Calculate the percent error for the voltages and currents. Percent error is calculated as:
Where theoretical are values using V = 9V, and ideal
resistor values, and experimental are using actual voltage and resistor values you measure with your multimeter.
Resistor Color Codes – Brown resistors
1st
and 2nd color bands (representing first two digits of resistance)
Black = 0 Orange
= 3 Blue = 6 Gray = 8
Brown = 1 Yellow = 4 Violet = 7 White = 9
Red = 2 Green = 5
3rd
color band (multiplier)
Black x 1 Orange
x 1k Blue x 1
meg
Brown x 10 Yellow x 10k Silver
÷ 100
Red x 100 Green
x 100k Gold ÷ 10
4th
color band (tolerance)
Gold = 5% Silver = 10% None = 20%
Blue (precision) Resistor: 1st 3 bands = 1st three num’s of R, 4th band is multiplier, 5th is tolerance.
#1~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~:
#2~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#3~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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