2. An aluminum (p=2.7x10-2m) wire has a cross-sectional area of 5.1x107 m?.A. If the wire is cylindrical, what is the radius of the wire?B. What is the resistance of 8.3 m of the wire?C. If another aluminum wire has twice the cross-sectional area but the same length, is its resistancelarger than, smaller than, or the same as the first wire? Explain.D. What is the resistance for 8.3 m of the wire if the cross-sectional area is 2.7x107 m??

(A) Let A be the cross-sectional area of the aluminium wire. Write the expression for the circular…

Answered: 2. An aluminum (p=2.7x10-2m) wire has a…

Physics for Scientists and Engineers, Technology Update (No access codes included)

9th Edition

ISBN:9781305116399

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter27: Current And Resistance

Section: Chapter Questions

Problem 27.4OQ

See similar textbooks

Similar questions

Unreasonable Results (a) What current is needed to transmit 1.00 102 MW of power at 10.0kV? (b) Find the resistance of 1.00 km of wire that would cause a 0.0100% power loss. (c) What is the diameter of a 1.00-km-long copper wire having this resistance? (d) What is unreasonable about these results? (e) Which assumptions are unreasonable, or which premises are inconsistent?
(a) Digital medical thermometers determine temperature by measuring the resistance of a semiconductor device called a thermistor (which has a= - 0.0600/°C ) when it is at the same temperature as the patient. What is a patient's temperature if the thermistor’s resistance at that temperature is 82.0% of its value at 37.0°C (normal body temperature)? (b) The negative value for a may not be maintained for very low temperatures. Discuss why and whether this is the case here. (Hint: Resistance can’t become negative.)
Unreasonable Results (a) To what temperature must you raise a resistor made of constantan to double its resistance, assuming a constant temperature coefficient of resistivity? (b) To cut it in half? (c) What is unreasonable about these results? (d) Which assumptions are unreasonable, or which premises are inconsistent?
1.A burning lamp is marked 800 kW, 230 kV. (a) How much current flows through the lamp? (b) What is its resistance? 2.Compute the work and the average power required to transfer 1000 kC charge in 0.5 hours through a potential rise of 60 V. 3.How much electrical energy is used when a 345 kV appliance operates at 4 A for 3 minutes? 4. A resistor carries a current of 0.46 mA when the potential difference across it is 25 volts. What is the resistance of the resistor? 5. A potential difference of 0.78 kV is applied to the two resistors of 5.3 Ω and 4.9 Ω connected in series. Find (a) the combined resistance of the two resistors, (b) the current flowing in the circuit, and (c) the potential difference across each resistor. 6. A machine part has a resistor ? protruding from an opening in the side. This resistor is connected to three other resistors, as shown in the figure below. An ohmmeter is connected across ? and ? reads 2.00 Ω. What is the resistance of ?? 7. A charged…
A cylindrical conductor has resistance of R0 = 120 Ω. It has length L, radius of the cross section r, and resistivity ρ. Part (a) Express the resistance in terms of L, r, ρ. R0 = P L/π r2 This equation is incorrect Part (b) If the resistivity increases by a factor of 3, what would the value of the new resistance be, in ohms? Rρ =360 Part (c) If the resistivity was restored to its original value and instead the length of the conductor decreased by a factor of 3, what would the value of the new resistance be, in ohms? Rl = Part (d) If the resistivity and length of the conductor were at their original values and the radius of the conductor increased by a factor of 6, what would be the value of the new resistance, in ohms? Rr =
3. What will be the resistance of a copper wire that has a radius of 2 cm and length of 100 cm? The resistivity of the copper wire is 1.7x10^(-8) ohm.meter? a. 400 b. 500 c. 600 d. NONE OF THE CHOICES 4. Calculate the temperature of a wire if its resistance is increase to 200 ohm from 150 ohm at 25 degree Celsius. The temperature coefficient of the wire is 0.0225 per degree Celsius. a. 46.28 b. 26.48 c. 84.26 d. NONE OF THE CHOICES 5. Find the current rating of a defibrillator that can pass electric charge at 200 mA at 0.127 seconds. Calculate also the number of electrons on that particular time. a. 2.57 A and 125 electron b. 5.57 A and 1250 electron c. 7.57 A and 12500 electron d. NONE OF THE CHOICES Please don't write in a paper. I can't understand handwritten well.
A 30.0 m long extension cord is made from two #19 gauge copper wires. (a) What is the resistance of the wire at 200C? The diameter of the copper wire is 0.912 mm.(b) If the copper wire is replaced by an Aluminium wire of the same length, what is the diameter so that the new wire has a resistance no greater than the old?
A 15m long copper wire has a cross-sectional radius of 3mm. (a) What is the resistance of the wire? (b) If 200mA of current flows through the wire, what is the voltage drop of the wire at 20°C? (c) What is the voltage drop per meter at 20°C
1.) The radius of 22-gauge Nichrome wire is 0.32 mm. (a) Calculate the resistance per unit length of this wire. (b) If a potential difference of 10 V is maintained across a 1.0-m length of the Nichrome wire, what is the current in the wire? 2.) An electric heater is constructed by applying a potential difference of 120 V across a Nichrome wire that has a total resistance of 8.00 V. Find the current carried by the wire and the power rating of the heater.
1. Suppose you wish to fabricate a uniform wire out of 1.05 g of copper. If the wire is to have a resistance R = 0.660 Ω, and if all the copper is to be used, find the following. (a) What will be the length of the wire? ______ m (b) What will be the diameter of the wire? ______ mm 2.A rectangular block of copper has sides of length 17 cm, 26 cm, and 48 cm. If the block is connected to a 5.0 V source across two of its opposite faces, find the following. (a) What is the maximum current the block can carry? _____ A (b) What is the minimum current the block can carry? _____ A ANSWER BOTH PLEASE 1 and 2!!
2. If a circuit element can withstand a maximum current of 15 A, how many electrons can pass through it each second?3. How many electrons are transferred in a 10.0 A current that runs for 3.0 s?4. If 2.00 × 102mA of current flows through the filament of a light bulb, how many electrons would pass through the filament in 30.0 s?5. What feature of a river is most similar to current in an electric circuit? (A) The depth of the river measured in meters (B) The temperature of the water measured in degrees Celsius (C) The vertical drop between two points along the river measured in meters (D) The volume of water moving past a point measured in liters per second
1) A resistor has a value of 20 ohms (Ω) when it is at 15 degrees Celsius. If the coefficient of thermal resistivity is 3.5 x 10-3/ Celsius, determine the value of the resistance at 97 degrees Celsius. Write your result to 3 significant figures. 2) A certain copper wire has a resistance of 10.0 ohm (Ω). a) At what point should the wire be cut so that the resistance of one segment is 4 times the resistance of the other segment? b) What is the resistance of each segment?

SEE MORE QUESTIONS

Recommended textbooks for you

Physics for Scientists and Engineers, Technology …

Physics

ISBN:

9781305116399

Author:

Raymond A. Serway, John W. Jewett

Publisher:

Cengage Learning

College Physics

Physics

ISBN:

9781938168000

Author:

Paul Peter Urone, Roger Hinrichs

Publisher:

OpenStax College

College Physics

Physics

ISBN:

9781305952300

Author:

Raymond A. Serway, Chris Vuille

Publisher:

Cengage Learning

Physics for Scientists and Engineers, Technology …

Physics

ISBN:

9781305116399

Author:

Raymond A. Serway, John W. Jewett

Publisher:

Cengage Learning

College Physics

Physics

ISBN:

9781938168000

Author:

Paul Peter Urone, Roger Hinrichs

Publisher:

OpenStax College

College Physics

Physics

ISBN:

9781305952300

Author:

Raymond A. Serway, Chris Vuille

Publisher:

Cengage Learning

College Physics

Physics

ISBN:

9781285737027

Author:

Raymond A. Serway, Chris Vuille

Publisher:

Cengage Learning

SEE MORE TEXTBOOKS