Kirchhoff’s Rules in Electric Power

Kirchhoff’s Rules in Electric Power

The post is of two assignments

1:Kirchhoff’s Rules and Electric Power
Introduction
In part one of this lab, we test Kirchhoff’s Loop and Junction Rules. In part two, we discover how to
maximize the effective power drawn from a non-ideal battery. Text Reference: Young and Freedman
§26.2 (Part 1) and §§25.4-5 (Part 2)
Procedure: The values for R0, R1, R2, R3, V0, and V1 will be provided in class (ask your TA).
Part 1:
Set up the circuit shown below with a power supply, three resistors, and two-decade resistance
boxes; use the digital multimeter (DMM) to measure the resistances which may be slightly different
from the values of resistance as given in the figure. Note that this circuit cannot be analyzed by
means of simple rules for resistors in series and parallel. Set the output of the power supply at V0 (V)
using digital voltmeter (DVM). Use the DVM to measure the potential differences across each of the
five resistors; keep track of which side is at higher potential in each case. Test Kirchhoff’s Loop
Rule for loops abcda, dcfed, and abcfeda. Next, use the ammeter capability of the DMM to measure
the currents through each resistor; keep track of the current direction in each case. Test Kirchhoff’s
Junction rule for junctions c and d. Report the results of your five tests; be sure to report your
agreement or disagreement. Address carefully any discrepancies.
Figure 1: Circuit for part 1.
Part 2:
Set up the circuit shown on the next page with a power supply and two-decade resistance boxes. Adjust
the resistance of the internal resistor R0 and the voltage V1 from the power supply according to the
instructions given in class (check the values of R0 and V1 by DMM). The combination of the power
supply plus R0 plays the role of a battery with internal resistance (the internal resistance of the power
supply is negligible). Now vary the load resistance RL from 10 ? to 1280 ?, increasing the resistance
by a factor of two each time. For each value of RL, record the resulting values of I and VRL.
We are interested in the power dissipated by RL, as a function of RL; you now have the required data
to plot such a function (use your measured values of I and VRL to calculate the dissipated power, as
the nominal values of the decade resistance box are not to be trusted). Enter your values in Graphical
Analysis and plot the function of interest; you will increase the accuracy of your plot if you measure
Page 2 of 2
the values of RL with your DMM instead of using the values from the decade resistance box. From
your plot, read off the value of RL for which the dissipated power is a maximum and compare with
measured value of R0.
The power dissipated in the load resistor is given by following expression
???? = ? ????1
????0 + ????????
?
2
????????
You have to show the derivation of this expression in your lab report. To explain your result, some
calculus is required. To find the value of the load resistance where the power dissipated is a
maximum take the derivative of PRL with respect to RL, set that derivative equal to zero, then solve
for RL. Show this work in your analysis.
To quantify the comparison from your plot, use the curve-fitting capability of Graphical Analysis.
Use the equation for PRL as a function of RL and fit your plot to this theoretical equation. Compare
the resulting constants with your measured values of R0 and V1 (again, measure V1 with your DVM
instead of trusting the power – supply meter). Report these comparisons in your conclusions.
Figure 2: Circuit for part 2.
Notes and Hints
1. Don’t forget to include your calculation of the value of RL that maximizes the power dissipated by
the load resistor.
2. Use your measured values of I and V to determine PRL for plotting versus RL. The curve fitting can
be done using ANALYZE/CURVE FIT in Graphical Analysis. For ease of inputting the function use
parameters A instead of e and B instead of R0. Once you define the function you can check
“automatic” under fit type in the upper right corner. Graphical Analysis will then return the values
of A and B that provide the best fit to your data. These should match the values in your circuit. Do
they?
Self-assessment questions:
1. State Kirchhoff’s junction rule.
2. State Kirchhoff’s loop rule.
3. What is the unit of power?

2: case study analysis with data flow diagram

Order Description

case study analysis with data flow diagram (DFD)
OBJECTIVE: The student will identify and describe a technology implementation and data flow solution in 1500- 2000 words aimed at improving /resolving health care deficiency.

The Problem: A 528 bed tertiary care facility with a network of over 40 private and employed, primary and specialty care practices and several care environments for geriatric patients and behavioral health needs offers web-based Portal technology to over physician practices to coordinate patient care. The general medical association is a resident-based practice within the tertiary care facility providing internal medicine and family care services with 63 residents, seven attending physicians and several mid-level providers (NPs & PAs) across two geographically separate locations on the same campus – the outpatient department (OPD) and women’s health (OB-GYN) clinic. Together, the OPD and OB-GYN see about 32,000 patients annually with approximately 80% of patients on Medicaid, 10% with commercial insurance, and 10% self-pay.

The physical layout of staff work areas and constant rotation of residents create an inefficient environment for several health care delivery processes such as timely prescription renewals. The environment also strains relationships with patients, pharmacies, and clinic staff with the handling of multiple redundant phone calls and faxes from the same patients and pharmacies inquiring about the status of prescription renewal requests.

Your Solution: Based on the information provided and your creativity, identify and describe an effective technology implementation (in a minimum of 1500 words) and provide a data flow solution aimed at improving/resolving some aspect of healthcare information delivery.

You must also provide a DFD depicting your solution (This is NOT a flow chart). Select a health care specialty or department (i.e; pharmacy, nursing, surgery, outpatient clinic, urgent care, etc.), related to the above case study. Create a data flow diagram that demonstrates how health information moves using technology assistance for some aspect (i.e; patient safety, efficiency, quality, risk management, etc.) or process of healthcare information delivery performed by or in a chosen specialty. Your design should clearly identify the complete data flow. You may select any health care information delivery processor from one of the suggestions provided.

The APA formatted paper will be a minimum of 1500 to maximum of 2000 words, double spaced pages, using Times New Roman font size 12pt. The abstract and title page are not included in the page or word count.

IMPORTANT: When students submit this assignment, student work will be submitted to a plagiarism prevention tool (Turnitin). See the CGCE Standard Policies for more information.

Grading Rubric for Case Study Analysis with DFD

To earn full credit (22 points):

Case Study/Analysis with DFD Points
There is a clearly identified data flow problem. There is evidence of a viable technology implementation and/or workflow solution. 2
The essay is well-organized and the proposed solution adheres to the principles of logic for effective and efficient data flow. The essay clearly explains and is supported by the included data flow diagram. There are scholarly rationales for the external entities that are clearly identified and for the appropriate processing functions that are sequentially carried out throughout the described system. The proposed solution is consistent with the premise of the identified problem statement. 6
The included DFD is consistent with the text and clearly identifies the external entities that provide or receive data from the system being described with data being sent to and from the entities that are clearly identified. The data being sent to and from each entity is clearly identified. 3
The context diagram is depicted in correct relation to the external entities sending and receiving the data flows as described in the essay. There are processing functions carried out in the system and data connections between processing functions are logical and correct. Data connections between processing functions are correct. 4
This is a scholarly paper, expected to be well written, in a professional format using APA 6th edition style. It is expected that APA format is adhered to in ALL aspects, including spelling, grammar, punctuation, and presentation. A reference page is included at the end of the paper. (Abstract is optional). Abstract and reference list do not count toward the length of the paper. 4
Guideline adherence: (minimum 1500 to 2000 words, excluding DFD) and at least 4 references are cited throughout the paper and a completed DFD. 3
Total points 22

Electric Power