REFERENCE: Ohm\'s law and circuit diagrams are discussed in Serway chapter 27. R

Question

REFERENCE: 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 Tolerance colors for numbers shown in the table below. (here Value Exponent are various mnemonics for remembering the cGlor order, one is "better be right great big venture Figure 1. Reading Resistor goes west.) The first two color bands on the resistor codes. 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 -silver resistor in Figure 1 would be 23x104 o 10%. For example, the red-orange-y 10% 230 t 23) k2. Black Brown Red Orange Yelow Green Blue Violet Gray White 0 1 12 13 5 6 9 PRE-LAB QUESTIONS 1. A circuit similar to the one you will be measuring has a current of 0.2 A flowing when the voltage is 4 V a) What is the measured value of the resistance? b) What color code does the resistor probably have? c) What is the current when the voltage is reduced to 3 Volts? d) 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 )

i = 0.2 A

Voltage V = 4 volts

using ohm's Law R = V / i

R = 4 / 0.2

R = 20 Ohm

b )

Red , Brown and Tolerance

c )

i = 0.2 A

Voltage V = 3 volts

using ohm's Law R = V / i

R = 3 / 0.2

R = 15 Ohm

d )

green - red - brown and tolerance

= 52 X 101

= 51 X 10 = 520 Ohm

Lowest

520 - 520 X 10 / 100

= 468 ohm

Highest

520 + 520 X 10 / 100

= 572 ohm

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