Experiment 3 Write Up

Experiment 3 Write Up - Purpose: To use a voltmeter and...

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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 1-5 2. Connect coil 1 as in Figure 1 3. Close switch and determine voltmeter and ammeter readings (V=1.00) 4. Repeat for coils 2-5 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 A-D, A-B, B-C, and C-D 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 2-4 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 Ohms was determined with measured voltage of 0.225 Volts and a current of 0.104 Amps. The theoretical resistance value
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This lab report was uploaded on 04/07/2008 for the course BIO 152 taught by Professor Rosburg during the Spring '08 term at Drake University .

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Experiment 3 Write Up - Purpose: To use a voltmeter and...

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