New York City College of Technology Ohm’s law & resistors in parallel & in series Lab 4 Class: PAY 1434В±475 Due date: March, 13 20144 Group Names: Hashish Sager Objectives: Our object is to confirm Ohm’s law by analyzing the dependence of the electrical current as a function of voltage and as a function of resistance. Also, we studied the current flow and voltage in series and parallel. Finally, the lab determined the equivalence resistance of series and parallel combination of resistors and compared the results with theoretical data. Theoretical Background:
The first thing that needs to be described in this lab is what the electric current l: I = The electric current is defined as charge over time and the unit is ampere (A). In a case where we have the voltage, resistance and current we can set the equation for resistance to be; R = where the unit is called Ohm (Q). “The current through a resistor is directly proportional to the applied voltage V and inversely proportional to the resistance” (College Physics Laboratory Experiments, 43) in our lab experiment we used some machinery to produce and to measure voltage and some current.
We were then able to find its resistance. These apparatus are called ammeter which displays the amount of current in circuit, and the voltmeter to read the voltage (potential difference). Reminding that this diagram is named circuit and V is applied across the ends of the metallic conductors. In parallel and in series. The formula to find the resistance through series is fairly easy; it looks a lot like the formula in series for conductors. It’s basically RA+ORB+RCA = ARQ.
Base your answer on your experimental data. The resistance does closely follow Ohm’s law because when using the data mathematically it is closely related to the resistance present in the data. 2. A typical color television draws about 2. 5 A when connected a VI source. What is the effective resistance of the TV set? I = , R -48 n 3. Explain the difference between series and parallel connections. In a series circuit he charge is I/Q + 2/Q + while in a parallel connection, the charge is added to the total voltage. 4.
Does your experiment present evidence that the current divides in a parallel circuit? No. 5. From your experimental observations of a series circuit, what relationship do you find between the voltages across the individual resistance and voltage across the entire series group? The voltage in a series compared to parallel is much lower 6. From your experimental observations of a series circuit, what relationship do you find between the voltages across the individual resistance and current flow across he entire series network? The resistance is constant. 7.
Conclusion: Our results for 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 measurements of the voltage and current without resistance being 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
