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# physics lab report group four project

Extracts from this document...

Introduction

Data Collection Table (1): the voltage between the plates and current flowing through the circuit as the distance between the plates (placed in the 1:1 mountain soil to water suspension) was varied. Trial Voltage (V) (V) (�0.2V) Current (I) (mA) (�0.01mA) Distance between plates (l) (cm) (�0.5cm) Length of plates (L) (cm) (�0.1cm) Width of plates (W) (cm) (�0.1cm) 1 15.0 0.04 7.0 5.5 3.5 2 15.0 0.07 4.0 5.5 3.5 3 14.2 0.15 1.0 5.5 3.5 Table (2): the voltage between the plates and current flowing through the circuit as the distance between the plates (placed in the 1:1 garden soil to water suspension) was varied. Trial Voltage (V) (V) (�0.2V) Current (I) (mA) (�0.01mA) Distance between plates (l) (cm) (�0.5cm) Length of plates (L) (cm) (�0.1cm) Width of plates (W) (cm) (�0.1cm) 1 15.0 0.05 6.5 4.0 3.5 2 14.4 0.11 2.5 4.0 3.5 3 13.8 0.17 1.0 4.0 3.5 Data Processing and Presentation 1. Conversion of measurements to SI units Table (3): the voltage between the plates and current flowing through the circuit as the distance between the plates (placed in the mountain soil suspension) ...read more.

Middle

its resistivity, l its length, and A its cross-sectional area. Assuming the substance is ohmic, its resistance R will be given by the equation , where V is the potential difference across the substance and I the current flowing through it. By substituting for R in equation (1.1), we get that: (1.2) If both sides of equation (1.2) are multiplied by , then: (1.3) Since conductivity (?) is equal to the reciprocal of resistivity: i.e. , the conductivity of a substance is given by the following equation: (1.4) a. Mountain Soil Trial one Substitute 15.0 V for V, 0.00004 A for I, 0.070 m for l, and 0.0019 m2 for A: Trial two Substitute 15.0 V for V, 0.00007 A for I, 0.040 m for l, and 0.0019 m2 for A: Trial three Substitute 14.2 V for V, 0.00015 A for I, 0.010 m for l, and 0.0019 m2 for A: b. Garden Soil Trial one Substitute 15.0 V for V, 0.00005 A for I, 0.065 m for l, and 0.0014 m2 for A: Trial two Substitute 14.4 V for V, 0.00011 ...read more.

Conclusion

3. The uncertainty of the ammeter may have caused errors in current measurements. 4. The uncertainty in the voltmeter may have caused errors in potential difference measurements. 5. The temperature of the suspension may have increased during the experiment. As a result, its resistance will also increase since the resistance directly proportional to the temperature of the substance. 6. Approximation when measuring the dimensions of the copper plates: there was an uncertainty of �0.1cm in length and width measurements. This may have caused error in the final results of the experiment. 7. Approximation when measuring the distance between the copper plates: there was an uncertainty of �0.5cm in distance measurements. This may have caused error in the final results of the experiment. 8. The Improvements 1. Using an ammeter with lower resistance to minimize the contribution of the ammeter to the total resistance in the circuit. 2. Using a more accurate voltmeter to minimize errors in potential difference measurements. 3. Using a more accurate ammeter to minimize errors in current measurements. 4. Using wires with lower resistance to reduce the contribution of the wires to the total resistance in the circuit. ?? ?? ?? ?? 1 ...read more.

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