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Download Experiment Name Student Name:Sajedah AlMarzouq ID# 20700199
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Experiment Name Student Name:Sajedah AlMarzouq ID# 20700199 Section: 213 Submission date: 1/2/2013 PHYS 1411: Introductory Physics Lab Lab Instructor: Nouf Al-Jalaud Prince Mohammad Bin Fahd University Fall 2012-2013 1. Abstract (Objective) 0.5 point Ohm’s law is used in electrical engineering to calculate the relationship between current, voltage and resident. We need this experiment in every day life such as light bulls and electronic stoves. So, we have to verify that Ohm's law is satisfied for three different resistors. The purpose of this experiment is to understand Ohm's Law. 2. Theory 0.5 point A current I flows through an object when an electric potential difference V is placed across the object. Mathematically this law is expressed as: V = I R or Where: V = Voltage (the potential difference between two points which include a resistance). I = Current flowing through the resistance. R = Resistance Series Rs= R1+R2 Parallel 2 3. Method First try to find R1 Find R2 Find the Series resistance by using the specific draw and formula Find the parallel resistance by using the specific draw with special sign and formula. 3 4. Data Parallel resistance Draw the parallel after we find R1 & R2 Draw the circuit diagram as shown above. Arrange the apparatus as per the circuit diagram. Make the connections as per circuit diagram. All connections must be neat and tight. Take care to connect the ammeter and voltmeter with their correct polarity.) + and – Adjust the rheostat to get a small deflection in ammeter and voltmeter. Record the readings of the ammeter and voltmeter T 1 2 3 Voltage 0.352 0.364 0.374 Current 0.031 0.032 0.034 11.3 11.375 11. Total =33.675 R1=11 R2=5.8 R1xR2 \ R1+ R2 = 16.8 4 Series resistance Draw the circuit diagram as shown above. Arrange the apparatus as per the circuit diagram. Make the connections as per circuit diagram. All connections must be neat and tight. Take care to connect the ammeter and voltmeter with their correct polarity.) + and – Adjust the rheostat to get a small deflection in ammeter and voltmeter. Record the readings of the ammeter and voltmeter T 1 2 3 Voltage 0.553 0.621 0.631 Current 0.026 0.029 0.631 21.2 21.4 1 Total= 43.6 R1= 18 R2=25 R1+R2 =43 5 5. Data Analysis Overall, both parts of this lab demonstrated the relationship outlined by Ohm’s Law and fostered a higher comprehension of the mechanisms driving circuit behavior. The direct relationships between voltage, current, and resistance allow measurement of the voltage and current without resistance being known. Additionally, the ability to manipulate voltage allowed the experiment to contain a sense of systematic collection of data to provide a contextual experimental example of the relationships in Ohm’s law. Moreover, the experiment also demonstrated how the different configurations of resistors, parallel or in a series could play a role in the behavior of the circuit and its components. In conclusion, this lab effectively helped grant a higher understanding of how circuits are governed by Ohm’s law. 6. Conclusion The value of voltage range in circuit will be liner with the value of resistor chosen and perpendicular with the value of current resulted 6