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4. Calculate the resistance of a 100 m length of wire having a uniform cross - sectional area of 0.02 mm2 and having a resistivity of 40 micro ohm.cmil. If the wire is drawn out to four time its original length, calculate its new resistance.

4. Calculate the resistance of a 100 m length of wire having a uniform cross - sectional area of 0.02 mm2 and having a resistivity of 40 micro ohm.cmil. If the wire is drawn out to four time its original length, calculate its new resistance.

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
10th Edition
ISBN:9781337399128
Author:Russell E. Smith
Publisher:Russell E. Smith
Chapter12: Electronic Control Devices
Section: Chapter Questions
Problem 14RQ
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2 The tungsten filament in an incandescent lamp has a resistance of 9.8 ohms at a room temperature of 20°C and resistance of 132 ohms at normal operating lemperature. Calculate the temperature of the heated filament. (a = 0.0045). %3D Four loads A, B, C, andD are connected in parallel. Given the following specifications: RA = 30 ohms, Rs = 25 ohms, Rc=20, Ro= 15 ohms, and lc=5.5 amps. Calculate (a) the total resistance, (b) , Is, and lp. (c) the total current (d) the power in each resistor and (e) voltage source. 4. Calculate the resistance of a 100 m length of wire having a uniform cross sectional area of 0.02 mm2 and having a resistivity of 40 micro ohm.cmil. If the wire is drawn out to four time its original length, calculate its new resistance. 5. A 1,000 - ft length of copper wire (p = 10.37 N- CM/ft) has a resistance of 40.8 ohms. What would be the resistance of the aluminum wire (p 17 0-CM/ft) of a similar cross-sectional area having a length of 500 f?
Transcribed Image Text:2 The tungsten filament in an incandescent lamp has a resistance of 9.8 ohms at a room temperature of 20°C and resistance of 132 ohms at normal operating lemperature. Calculate the temperature of the heated filament. (a = 0.0045). %3D Four loads A, B, C, andD are connected in parallel. Given the following specifications: RA = 30 ohms, Rs = 25 ohms, Rc=20, Ro= 15 ohms, and lc=5.5 amps. Calculate (a) the total resistance, (b) , Is, and lp. (c) the total current (d) the power in each resistor and (e) voltage source. 4. Calculate the resistance of a 100 m length of wire having a uniform cross sectional area of 0.02 mm2 and having a resistivity of 40 micro ohm.cmil. If the wire is drawn out to four time its original length, calculate its new resistance. 5. A 1,000 - ft length of copper wire (p = 10.37 N- CM/ft) has a resistance of 40.8 ohms. What would be the resistance of the aluminum wire (p 17 0-CM/ft) of a similar cross-sectional area having a length of 500 f?
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