Monday

Circuits WS & Lab


Whoops!  I had a typo in #3, try this one out instead!



 

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:



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.

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