experiment is conducted to measure the electrical resistivity of Nichrome in the

ID: 1777775 • Letter: E

Question

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 measuremvents, s studesr use 3o gmge we which has a cross- sectional area of 7.30 x 108 m2. The student measures the potential difference across the wire and the current in the wire with a voltmedr and an ammetet, respecivey 0.5-40 1.028 .543 5.22 5.82 5.94 0.414 0.281 (a)For each set of measurements given in the table taken on wires of three different kengths, calculabe the resistance of the wires and the corresponding vakues of the resistivity (m 1028 1.543 (b) What is the average value of the resistivity? (e) Explain how this value compares with the value given in the Table of Resistives Need Help?

Explanation / Answer

L(m)

V(V)

I(A)

R=V/I ()

0.54

5.22

0.72

7.25

1.028

5.82

0.414

14.05797101

1.543

5.94

0.281

21.13879004

1 = R1A/L1 = (7.25*7.30*10^-8)/0.540 = 9.80*10^-7 .m

2 = R2A/L2 = (14.06*7.30*10^-8)/1.028 = 9.98*10^-7 .m

3 = R3A/L3 = (21.14*7.30*10^-8)/1.543 = 10.0*10^-7 .m

(ave) = (1+ 2+ 3)/3 = [(9.80+9.98+10.0)/3]*10^-7 = 9.93*10^-7 .m

c)(ave)/ (from table) = (9.93*10^-7)/…………… = ………………