🏷️ LIMITED TIME OFFER: GET 20% OFF GRADE+ YEARLY SUBSCRIPTION →
Log in
Physics
1
answer
0
watching
56
views

An experiment is conducted to measure the electrical resistivity of Nichrome in the form of wires with different lengths and cross-sectional areas. For one set of measurements, a student uses 30-gauge wire, which has a cross-sectional area of 7.30 x 10-8 m2. The student measures the potential difference across the wire and the current in the wire with a voltmeter and an ammeter, respectively.

(a) For each set of measurements given in the table taken on wires of three different lengths, calculate the resistance of the wires and the corresponding values of resistivity.

(b) What is the average value of the resistivity?

(c) Explain how this value compares with the value given in the table for resistivities and temperature coefficients of resistivity for various materials.

Watch
1
answer
0
watching
56
views

For unlimited access to Homework Help, a Homework+ subscription is required.

Verified Answer
Shelley Sundae Naparota
Shelley Sundae NaparotaLv10
3 Dec 2020

Unlock all answers

Get 1 free homework help answer.
Already have an account? Log in
12 Dec 2020

Answer verification

This is a step by step verification of the answer by our certified expert.
Subscribe to our livestream channel for more helpful videos.
Subscribe
Share

Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

A student wants to check the resistance of a resistor by measuring the voltage across it (V) and the resulting current through it (I) and then calculating the resistance R=V/I. He measures four different values of V and the corresponding currents I, as follows:

Voltage, V (volts): 11.2 13.4 15.1 17.7
Current, I (amps): 4.67 5.46 6.28 7.22

(a) Calculate the four corresponding values of R (which will come out in ohms). What is his best estimate for R, and what is the random component of its uncertainty (delta_Rrandom)?

(b)The resistor is rated at 2.50 ohms, which does not lie within the range R_best + or - deltaR_random, so he considers the possibility that the voltmeter and ammeter suffer some systematic error. The lab technician states that many of the meters in the lab have up to a 2 percent systematic error. Use error propagation to find the possible systematic error in R, and then combine the systematic and random errors to give the total uncertainty. (In both calculations, combine errors in quadrature.) What is his final answer and how does it compare with the given value?

A student wants to check the resistance of a resistor by measuringthe voltage across it (V) and the resulting current through it (I)and then calculating the resistance R=V/I. He measures fourdifferent values of V and the corresponding currents I, asfollows:

Voltage, V (volts): 11.2 13.4 15.1 17.7
Current, I (amps): 4.67 5.46 6.28 7.22

(a) Calculate the four corresponding values of R (which will comeout in ohms). What is his best estimate for R, and what is therandom component of its uncertainty (delta_Rrandom)?

(b)The resistor is rated at 2.50 ohms, which does not lie withinthe range R_best + or - deltaR_random, so he considers thepossibility that the voltmeter and ammeter suffer some systematicerror. The lab technician states that many of the meters in the labhave up to a 2 percent systematic error. Use error propagation tofind the possible systematic error in R, and then combine thesystematic and random errors to give the total uncertainty. (Inboth calculations, combine errors in quadrature.) What is his finalanswer and how does it compare with the given value?

<p>A student wants to check the resistance of a resistor by measuring the voltage across it (V) and the resulting current through it (I) and then calculating the resistance R=V/I. He measures four different values of V and the corresponding currents I, as follows:<br /><br />Voltage, V (volts): 11.2 13.4 15.1 17.7<br />Current, I (amps): 4.67 5.46 6.28 7.22<br /><br />A) Calculate the four corresponding values of R (which will come out in ohms). What is his best estimate for R, and what is the random component of its uncertainty (deltaRrandom)?<br /><br />B)The resistor is rated at 2.50 ohms, which does not lie within the range Rbest + or - deltaRrandom, so he considers the possibility that the voltmeter and ammeter suffer some systematic error. The lab technician states that many of the meters in the lab have up to a 2 percent systematic error. Use error propagation to find the possible systematic error in R, and then combine the systematic and random errors to give the total uncertainty. (In both calculations, combine errors in quadrature.) What is his final answer and how does it compare with the given value?</p>

Weekly leaderboard

Home
Homework Help 3,900,000
Physics 110,000
Start filling in the gaps now
Log in