OHM’S LAW question Ohm\'s law and circuit diagrams are discussed in Serway chapt

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OHM’S LAW

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Ohm's law and circuit diagrams are discussed in Serway chapter 27. READING RESISTOR CODES Resistors have values marked on them using a code of colors for numbers shown in the table below. (There are various mnemonics for remembering the color order, one is "better be right or your great big venture goes west.") The first two color bands on the resistor give the value, and the third is an exponent. The last one or two indicate the precision. A gold band indicates 5% tolerance, a silver band 10%. For example, the red-Orange-yellow-silver resistor in Figure 1 would be 23x104ohm 10%=(230 23)k ohm PRE-LAB QUESTIONS A circuit similar to the one you will be measuring has a current of 0.2 A flowing when the voltage is 4 V. What is the measured value of the resistance? What color code does the resistor probably have? What Is the current when the voltage is reduced to 3 Volts? What is the lowest and highest value of resistance a green-red-brown resistor would usually have if it has a silver tolerance band?

Explanation / Answer

a) R = V/I = 4/0.2 = 20 ohms

b) R = 20*100 red - balck-black

c) I = V/R = 1/20 = 0.05 A

d) Lowest value of resistance = 20 - 10*20/100 = 18 ohms

Highest value of resistance = 20 + 10*20/100 = 22 ohms

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