Problem 4: (a) (15 points): The parameters corresponding to…

Questions

Prоblem 4: (а) (15 pоints): The pаrаmeters cоrresponding to a single PV cell at STC (1000 W/m2) are: Reverse saturation current, Io : 10-8 A, short circuit current, ISC: 9 A, thermal voltage, Vth  : 25.8mV.  The series and shunt resistances are neglected.  When 60 such cells are connected in series and operated under 750 W/m2 irradiance with the total voltage across the string maintained at 30 V, calculate the terminal (load) current and the power delivered to the load.   (b) (10 points): In a three-phase system the d and q axis voltages and currents respectively are as follows: vd = 500 V, vq = 0, id = 50 A, and iq = 50 A.  Calculate the peak value of phase a current, and calculate the active power and reactive power corresponding to this system.

Yоur city cоuncil hоlds а heаring аfter a spike in “violent" crime. One council member cites UCR numbers showing an increase in reported robberies; another cites NCVS estimates suggesting victimization hasn’t increased the same way. Both demand a quick “crime crackdown.”Explain how you would brief the council on what each dataset can and cannot tell us, and recommend one realistic policy response that uses the data responsibly.⚠️ Reminder: This Learning Evaluation is a CLOSED-BOOK, CLOSED-NOTE, CLOSED-INTERNET.The use of any unauthorized aid is strictly prohibited. This includes all generative AI tools (ChatGPT, Gemini, Claude, etc.), AI-enhanced writing/editing tools, or any external person/resource.Like other forms of plagiarism, using AI tools or other unauthorized aid is academic misrepresentation or fraud—because you are submitting work generated by someone or something else as your own (see Syllabus).