Victor Adams - Assignment 3 - Electrical

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Foothill College *

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22

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Mechanical Engineering

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Apr 3, 2024

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Water Supply Technology Intro to Process Control WST – 086 Assignment 3 41 points E = I x R P = I x E Table 1. Specific Resistivity. Material r, resistivity, cmil- /ft Silver 9.8 Copper (drawn) 10.37 Gold 14.70 Aluminum 17.02 Tungsten 33.20 Brass 42.10 Steel 95.80 Table 2. American Wire Gauge for Copper Wire AWG Number Diameter, mil Area cmil /1000 ft at 25°C /1000 ft at 65°C 08 128.0 16500 0.641 0.739 10 102.0 10400 1.020 1.180 12 81.0 6530 1.620 1.870 14 64.0 4110 2.58 2.97 16 51.0 2580 4.09 4.73 18 40.0 1620 6.51 7.51 20 32.0 1020 10.4 11.9 22 25.3 642 16.5 19.0 24 20.1 404 26.2 30.2 Table 3. Ampacities of Insulated Copper Conductor National Electrical Code Conductor Size (AWG) 60°C (140°F) Types: TW, UF 75°C (167°F) Types: FEPW, RH, RHW, THHW, THW, THWN, XHHW, USE, ZW 85°C (185°F) Type: V18 14 20 20 25 12 25 25 30 10 30 35 40 8 40 50 55 6 55 65 70
Water Supply Technology Intro to Process Control WST – 086 Assignment 3 41 points 1. What does a Wheatstone Bridge measure? ( 2 points ) A Wheatstone Bridge measures a change in resistance among a set of resistive elements. 2. True or False An electron has a positive charge in conventional theory current flow? ( 1 point ) True 3. True or False A Proton has a neutral charge in the atom? ( 1 point) False 4. A charge of 15 coulombs moves past a given point every second. What is the current flow? ( 2 points ) 15/1 = 15 amperes 5. Calculate the resistance of 500 feet of copper wire that has a cross- sectional area of 4110 cmil if the ambient temperature is 25°C. ( 5 points ) 6. Calculate the resistance of 500 feet of silver wire with a diameter of 0.001 inch if the ambient temperature is 25°C. ( 5 points ) 7. Find the total current ( I t) in a circuit that has two 250 Ohm resistors in series with a voltage source of 24 Vdc. Also find the voltage drop across each resistor, where V1 is the voltage across the first resistor and V2 is voltage across the other resistor. ( 10 Points )
_ It I1 _ I2 V t R 1 V 1 R 2 V 2 Water Supply Technology Intro to Process Control WST – 086 Assignment 3 41 points 8. In the parallel resistance circuit shown in Figure 3-4, assume that R1 = 100 Ohms R2 = 200 Ohms, and Vt = 100 Vdc. Find I1, I2, and It. ( 15 points ) Figure 3-4. Parallel resistance circuit
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