Consider the purchase of a 4-watt LED light to replace a 35-watt incandescent light. The LED light costs $3 and is estimated to save $0.48 per year in electricity costs if

● The voltage and current at the terminals of an automobile battery during a charge cycle are shown below a. Calculate the total charge transferred to the battery. b. Calculate the total energy transferred to the battery. v (V) 15 10 5- i (A) 30 20 10 5 5 10 15 20 25 10 15 20 25 t (ks) t (ks)

The numerical values for the currents and voltages in the circuit are given Find the total power developed in the circuit. a ia ib b - Vb + a Element b ic d f C + Vc Voltage (V) -8 -2 10 10 -6 ial -4 7 Current (A) -7 d 15 5 3 3 Vd e f + Vf

1) A load consisting of a 452 resistor, a 502 inductor and a 302 capacitor in series. The source is at 120 V (rms). Find the following. a) The source current (in phasor form). b) The real and reactive power consumed by the load. a) 5 points b) 5 points Z = R + j(X₁Xc) = 4+j2 V₂ 1=¼/= I = 24-j12= 26.83Z-26.57° A Z S = V₁I* = 2880 +j1440 P = 2880 W, Q = 1440 Var

5. Suppose a power plant has a nameplate capacity of 1 GW and a capacity factor of 0.8. If it operated for 1 full year, how much energy would it generate? (1 pt)

You can start discussion by answering the following questions and later replying or commenting on at least one of your peers' replies. Please keep online civility as per the instructions in the syllabus. Your answer and reply should be to the point and within three sentences maximum. Question 1: How is population growth affecting the natural resources of the world? Question 2: Among the conventional energy resources i.e. fossil based energy which one do you favor and why?

You can start discussion by answering the following questions and later replying or commenting on at least one of your peers' replies. Please keep online civility as per the instructions in the syllabus. Your answer and reply should be to the point and within three sentences maximum. Question 1: What are the benefits of hydropower? Question 2: How does a hydroelectric power station impact the environment?

2) The voltage and current of a Y-connected load are: Vab=25/15°V, Ic = 10275⁰ A Find the total real power consumed by the load. Note: read the subscripts of the voltage and current carefully. Ve Vc: 5 points P30: 5 points 25 √3 P36 = 3. Vab √3 P30 = 3|vc||1c| cos 25 √3 25 √3 00v. 01 105° - 75° = 30° €490° <15° +90° 10.cos(30°) = -Z105° = 375 W consumed by the load.

You can start discussion by answering the following questions and later replying or commenting on at least one of your peers' replies. Please keep online civility as per the instructions in the syllabus. Your answer and reply should be to the point and within three sentences maximum. Question 1: How do you define energy and power? Question 2: What's your thoughts on energy use and its effect?

You are a newly-hired energy planner for the city of Exampleville. Mayor Bigshot has decided that the city should become energy-independent, and has asked your supervisor, Bossperson, for a report discussing different options for doing so. Bossperson has tasked you with performing some calculations and discussing the strengths of different options based on those calculations. 6. There are 100,000 homes in Exampleville, and the average home has the following daily power demand profile. Each hour is an hour in a day, and "Watts" describes the average power demand during that hour:/nHour 1 Watts 600 Hour Watts 2 600 3 600 600 800 67 8 1000 1100 1200 1200 1000 1000 9 10 11 12 1200 13 14 15 16 17 18 19 20 21 22 23 24 1000 1000 1100 1500 1600 2200 4500 2200 1800 1000 800 600 a. How much energy in kWh does the average home use in a 24 hour period? (1 pt) b. How much energy in kWh does the average home use in 365 days? (1 pt) c. How much energy, in MWh, do all of the city's homes combined use in 365 days? (1 pt) d. Exampleville has several options for generating electrical power, each with different characteristics, listed below:

Section 3: Planning roof-top solar for an O'Neill colleague (20 pts) A colleague of mine is interested in rooftop solar energy generation. Below is his electricity use from Duke in the past year and a half. Kwh Year Month/na. What is his average monthly electricity usage and his total annual usage? (2 pts) b. Assume he would like to get an electric car in the future, so the system specification should be at 150% of his total annual electricity use. How many 400 W photovoltaic panels will my colleague need? State your assumptions clearly, including how many hours of sunlight he will get in Bloomington Indiana. (5 pts) c. How much does it cost to install solar panels? Most installers set the price according to the system's wattage, with the average cost between $2.50 and $5 per watt. Please give us the range of your cost estimate. (5 pts) d. Should he buy the solar PV system? Discuss any US governmental incentives for such a system at the moment and how would you convince him one way or the other? (8 pts)