6. A length of a copper telephone line has a resistance of 24 ohms at 20°C.What is the resistance on a hot summer day when its temperature raisedby 26C°?7. A certain cooper wire has a resistance of 25 ohms at 10°C. Take thetemperature coefficient at 10°C to be 0.00409/°C. What must be themaximum operating temperature of the wire if its resistance is to increaseby most 30%?8. The resistivity of iron at 0°C and 12°C is 8.68 x 10 *0-m and 9.75x 10 -8N-m respectively. Calculate the resistivity at 35°C9. One meter rod of 2 inches diameter is drawn until its resistance is 100times the initial resistance. Its length afterward is?10. The substation bus bar is made up of 1.5 inches round copper bars 30 ftlong. What is the resistance of each bar?11. What is the color code for a 8KQ, tolerance + 10% resistor?12. Find the nominal value of the resistance of the resistor shown.

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Answered: 6. A length of a copper telephone line…

6. A length of a copper telephone line has a resistance of 24 ohms at 20°C. What is the resistance on a hot summer day when its temperature raised by 26C0?

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter4: Transmission Line Parameters

Section: Chapter Questions

Problem 4.2P: The temperature dependence of resistance is also quantified by the relation R2=R1[ 1+(T2T1) ] where...

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Photoelectric

The photoelectric effect occurs when light (or similar incident radiation, including X-rays) falls on material together with a metal plate and causes it to emit electrons. The discovery of the photoelectric effect led to important new theories (and to a Nobel Prize for Albert Einstein). Photoelectric cells, or photocells, are utilized in burglar-alarm light detectors and garage-door openers (each employs a through-beam of light this is broken when something movements throughout it), and also to play soundtracks on film movies (in which a light beam shines through the soundtrack encoded at the film and is "read" with the aid of the photocells).

Question

6. A length of a copper telephone line has a resistance of 24 ohms at 20°C.
What is the resistance on a hot summer day when its temperature raised
by 26C°?
7. A certain cooper wire has a resistance of 25 ohms at 10°C. Take the
temperature coefficient at 10°C to be 0.00409/°C. What must be the
maximum operating temperature of the wire if its resistance is to increase
by most 30%?
8. The resistivity of iron at 0°C and 12°C is 8.68 x 10 *0-m and 9.75x 10 -8
N-m respectively. Calculate the resistivity at 35°C
9. One meter rod of 2 inches diameter is drawn until its resistance is 100
times the initial resistance. Its length afterward is?
10. The substation bus bar is made up of 1.5 inches round copper bars 30 ft
long. What is the resistance of each bar?
11. What is the color code for a 8KQ, tolerance + 10% resistor?
12. Find the nominal value of the resistance of the resistor shown.

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