Lab Reports 1 - Revision history

Shaproma: Blanked the page

2011-01-20T00:23:23Z

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Shaproma: /* Internal resistance (30 pnts) */

2011-01-17T05:36:13Z

Internal resistance (30 pnts)

Shaproma: /* Internal resistance (30 pnts) */

2011-01-17T05:35:53Z

Internal resistance (30 pnts)

Shaproma: /* Internal resistance (30 pnts) */

2011-01-17T04:42:27Z

Internal resistance (30 pnts)

Shaproma: /* Internal resistance (30 pnts) */

2011-01-17T04:41:57Z

Internal resistance (30 pnts)

Shaproma: /* Internal resistance (30 pnts) */

2011-01-17T04:41:44Z

Internal resistance (30 pnts)

Shaproma: /* Internal resistance (30 pnts) */

2011-01-17T04:40:58Z

Internal resistance (30 pnts)

Shaproma: /* Internal resistance (30 pnts) */

2011-01-17T04:40:34Z

Internal resistance (30 pnts)

Shaproma: /* Internal resistance (30 pnts) */

2011-01-17T04:38:35Z

Internal resistance (30 pnts)

Shaproma: /* Internal resistance (30 pnts) */

2011-01-17T04:34:46Z

Internal resistance (30 pnts)

← Older revision		Revision as of 00:23, 20 January 2011
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−	~~[https://wiki.iac.isu.edu/index.php/Electronics_Lab_Reports_RS Go Back to All Lab Reports]~~

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−	~~=Kirchoff's Law (50 pnts)=~~
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−	~~== Smokey Circuits==~~
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−	~~When doing these labs it is important to determine the limitations of your electrical components in order to avoid damaging them.~~
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−	~~This lab uses resistors. Resistors are vulnerable to melting if you push too much current through them.~~
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−	~~Resistors have power ratings ranging from 1/8 Watt up to several Watts. The common resistors are rated at 1/4 Watt. Let's assume this rating for the resistors in this lab.~~
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−	~~Determine the maximum voltage of the DC power supply you will use. (ie, 30 Volts)~~
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−	~~;<math> P =I^2R = V^2/R \Rightarrow R = \frac{V^2}{P} > \frac{\left (30 V \right)^2}{1/4 \mbox{Watt}} > 3600 \Omega</math>~~
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−	~~:By keeping your resistance values above 3600 <math>\Omega</math> you should be able to avoid burning up 1/4 Watt resistors when your max voltage is 30 Volts.~~
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−	~~The next objective is to use resistors which allow currents that you can measure with your voltmeter.~~
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−	~~;Since <math>V=IR \Rightarrow I = V/R = 30 \mbox{Volts}/3600 \Omega = 8\mbox{mA}</math>~~
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−	~~Determine the range of currents which the voltmeter can measure. (ie 1 mA)~~
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−	~~To get measurable currents you need low resistance BUT the lower resistances will need to have a high power rating. These two competing properties limit the range of resistances you can use.~~
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−	~~Select the three resistors you should use for this experiment.~~
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−	~~==Construct the circuit below==~~
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−	~~[[File:TF_EIM_Lab1.png \| 400 px]]~~
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−	~~==Enter the values of the DC voltage and Resisters that you used.==~~
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−	~~Use a voltmeter to measure the potential difference and resistances.~~
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−	~~{\| border="3" cellpadding="20" cellspacing="0"~~
−	~~\|Variable \|\|Measured Value~~
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−	~~\| <math>V_A </math> \|\| 1.570 V~~
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−	~~\| <math>R_1</math> \|\| 99.4 <math>\Omega</math>~~
−	\|-
−	~~\| <math>R_2</math> \|\| 990 <math>\Omega</math>~~
−	\|-
−	~~\| <math>R_3</math> \|\| 9.79 <math>k\Omega</math>~~
−	\|}
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−	~~==Enter the measured and predicted quantities in the table below==~~
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−	~~Given <math>V_A</math> and the values of all resistors, use Kirchoff's laws to predict~~
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−	~~a.) Predict the value of <math>V_B</math>~~
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−	~~b.) Predict the values of the three currents.~~
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−	~~c.) compare your predictions and measurements by filling in the table below.~~
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−	~~{\| border="3" cellpadding="20" cellspacing="0"~~
−	~~\|Variable \|\|Measured Value\|\| Predicted Value\|\| % Difference~~
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−	~~\| <math>V_B</math> \|\| 1.413 V \|\| 1.414 V \|\| 0.07 %~~
−	\|-
−	~~\| <math>I_1</math> \|\| 1.57 mA \|\| 1. 57 mA \|\| 0.00 %~~
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−	~~\| <math>I_2</math> \|\| 1.43 mA \|\| 1.43 mA \|\| 0.00 %~~
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−	~~\| <math>I_3</math> \|\| 0.144 mA \|\| 0.144 mA\|\| 0.00 %~~
−	\|}
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−	~~= Internal resistance (30 pnts)=~~
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−	Measure the internal resistance of a "D" cell battery by graphing the current on the x-axis and the measured voltage on the y-axis for several values of the resistance <math>R_L</math> shown in the circuit below. Begin with <math>R_L = 1k\Omega</math> and then decrease it by a factor of 5 for each subsequent measurement. You can use a volt meter to measure the current and potential difference.
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−	~~[[File:TF_EIM_Lab1a_fig.png \| 200px]]~~
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−	~~{\| border="3" cellpadding="20" cellspacing="0"~~
−	~~\| R_{Load} (<math>\Omega</math>) \|\| V (Volts)\|\| I (mA)~~
−	\|-
−	~~\| 990\|\| 1.536\|\| 1.56~~
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−	~~\| 99.4\|\| 1.529\|\| 15.20~~
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−	~~\| 46.3\|\| 1.519\|\| 31.82~~
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−	~~\| 10.3\|\| 1.448\|\| 121.8~~
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−	~~\| 0.47\|\| 0.667\|\| 1700~~
−	\|}
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−	~~[[File:RS lab1 pic1.png \| 600px]]~~
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−	~~=Questions (20 pnts)=~~
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−	~~#What conservation law is involved in Kirchoff's Loop Theorem?~~
−	~~#What does the slope in the internal resistance plot above represent?~~
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−	~~[[Forest_Electronic_Instrumentation_and_Measurement]]~~
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−	~~[https://wiki.iac.isu.edu/index.php/Electronics_Lab_Reports_RS Go Back to All Lab Reports]~~

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