Purpose:
To use a voltmeter and ammeter to measure resistance of a conductor and to
study factors on which the resistance of a conductor depend. Also applying measurement
skills to verify the mathematical relations for resistance in a parallel, series, or
combination circuit.
Procedure:
1.
Record length, cross sectional area and resistivity for coils 15
2.
Connect coil 1 as in Figure 1
3.
Close switch and determine voltmeter and ammeter readings (V=1.00)
4.
Repeat for coils 25
5.
Measure resistance for resistors with multimeter and record in Table 5
6.
Calculate theoretical value of R
sth
R
pth
R
tth
7.
With R1, R2, and R3 set up as in Figure 5, use voltmeter to determine difference
in points AD, AB, BC, and CD
8.
Insert ammeter at A and record the current.
9.
Repeat for points B C and D.
10. Connect R1 R2 R3 as in Figure 6 and connect ammeter into circuit as shown in
position 1 and record the current through 1
11. Repeat for positions 24
12. Connect R1 R2 and R3 as in Figure 7
13. Measure current for all positions
14. Measure potential drop across each resistor
Data:
See attached
Results:
The first coil had a length of 10 meters with a cross sectional area of 2.913 x 10
7
.
A resistivity of 1.72 x 10
8
Ohms was determined with measured voltage of 0.135 Volts
and a current of 0.1846 Amps. The theoretical resistance value (0.5896 Ohms) was then
compared with the experimental resistance value (0.7313 Ohms) and a percent difference
of 24.03 % was found. The second coil had a length of 10 meters with a cross sectional
area of 7.293 x 10
7
. A resistivity of 1.72 x 10
8
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
This is the end of the preview.
Sign up
to
access the rest of the document.
 Spring '08
 Rosburg
 Botany, Ohms law, Resistor, ohm, Electrical resistance

Click to edit the document details