Remote 4 - Wheatstone Bridge (Resistance Measurement)
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Ahmed Alradaei
TA: Aishwarya Kulkarni
PHY 242, Section 13
2/21/2021
Step 1
:
Spool Resistance [Ω]
Multiplier R
1
/R
2
Decade Box
Resistance R
a [Ω]
Material
R
spool of Cu = 6.8
1/10
68
Copper
R
spool of Nickle-silver = 9.79
1/100
979
Nickle-silver
Step 3
:
Wire Diameter [m]
Gauge
# Length L [m]
Material
D
Cu = 3.2 * 10
-4
#28
32.5
Copper
D
Nickle-silver = 2.54 * 10
-4
#30
2
Nickle-silver
Step 5
:
Area
cu wire
= 8.0425 * 10
-8 m
2 Area
nickle-silver = 5.0671 * 10
-8 m
2
Step 6
:
ρ
cu = 1.683 * 10
-8 Ωm ρ
nickle-silver = 24.8 * 10
-8 Ωm
Q1
:
The obtained values of the resistivity in both copper and nickle-silver are closely the same with the experimented values from the list of resistivity. However, that indicates
that case in copper is, error will be a slight number and that can be due to calculations error when rounding. On the contrary, for nickle-silver, the obtained value fell in the same range given from the list and that can be ranged may be due to the effect of room temperature
.
Step7
:
ρ
cu temperature corrected = 1.696 * 10
-8 Ωm
ρ
nickle-silver temperature corrected = 24.82 * 10
-8 Ωm
Q2
:
Yes, the calculations done on step 7 are better, and they are too close from what were measured. Also, the slight difference between the values indicate that the measured values obtained were almost correct from what were obtained in step 7
.
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