W101BLLab07 - Physics 1BL KIRCHOFFS RULES Winter 2010 Introduction In this lab we will examine more complicated circuits First you will derive an

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Physics 1BL K IRCHOFF S R ULES Winter 2010 Page 1 Introduction In this lab we will examine more complicated circuits. First, you will derive an expression for equivalent resistance using Kirchhoff’s Rules. Then you will discuss the physics underlying Kirchhoff’s rules. Then you will practice drawing circuit diagrams from real circuits and vice versa. Finally, you will use Kirchhoff’s rules and your knowledge of equivalent resistance to analyze complex circuits. Pre-lab questions: How to read Resistor Color Codes First, find the tolerance band. It will typically be gold ( 5%) or silver (10%). Starting from the other end, identify the first band - write down the number associated with that color; in this case Brown is 1. Now 'read' the next color. Here it is blue, so write down a '6' next to the 1. (you should have '16' so far.) Now read the third, or 'multiplier', band and write down that number of zeros. (It is called a multiplier band because you are multiplying the first two bands by 10 to the power of the number of the third band.) In this example the multiplier band is Red (2) so the multiplier is 10 2 . The resistor value is 16 x 10 2 ohms or 1600 Ω or 1.6k Ω . If the multiplier band is Gold move the decimal point one place to the left. If the multiplier band is Silver, move the decimal point two places to the left. The tolerance band tells you how close to the stated value you can expect the actual resistance to be. Gold indicated 5% tolerance and Silver indicated 10% tolerance. Therefore, Gold tolerance resistors are between 95% and 105% of the value indicated by the color bands. If the resistor has one more band past the tolerance band, it is a Quality band. The Quality band indicates the failure rate of the resistor when operated at full power. # Color Mnemonic 0 Black Big 1 Brown Boys 2 Red Race 3 Orange Only 4 Yellow Young 5 Green Girls 6 Blue But 7 Violet Violet 8 Gray Generally 9 White Wins 1 st digit 2nd digit x10 ___ Multiplier First digit Second digit Multiplier Tolerance Quality
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Physics 1BL K IRCHOFF S R ULES Winter 2010 Page 2 1. Resistor color codes: a. What is the resistance of a resistor with the band colors Red Red Brown? b. What is the resistance of a resistor with the band colors Green Black Orange? c. What colors would you see on a 75 k Ω resistor? d.
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This note was uploaded on 04/20/2010 for the course PHYSICS PHYS 1B taught by Professor Staff during the Spring '10 term at UCSD.

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W101BLLab07 - Physics 1BL KIRCHOFFS RULES Winter 2010 Introduction In this lab we will examine more complicated circuits First you will derive an

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