## In this blog you will find the correct answer of the Coursera quiz Solar Energy Basics Coursera Week 2 Quiz mixsaver always try to brings best blogs and best coupon codes

Week- 2

Energy needs and sizing a PV system <MATH>

1. A unit for power is:

• Volts
• Milliamps
• Watts
• Amps

2. An electrical appliance which operates at 110 volts and 4 amps consumes ___ watts.

• 4
• 440
• 120
• 220

3. If PV system is needed that can produce 8000W of electrical power and the overall efficiency of the system is assumed to be 80%, what size system would need to be installed?

• 10,000W
• 8000W
• 9000W
• 6400W

4. The southern Midwest of the United States has an insolation value of 5.5 full-sun-hours. We would expect Fairbanks, Alaska to have an insolation value that is ___ that of the southern Midwest.

• Less than
• Greater than

5. You are consulting with a home owner about sizing a PV system for their house. They share their utility bill with you that contains the electrical usage table below. What is the total annual electrical energy usage at this location?

Month kWh
December 350
January 420
February 370
March 350
April 320
May 360
June 570
July 950
August 860
September 630
October 605
November 455
December 420
1 point

 6310

6. A 1200 W microwave oven uses 120 V of electricity, how much current (in amps) is the microwave drawing when in use?

 10

7. A television uses 75 W while in use. Assuming that it is used 4 hours every day, how much energy in kWh would the television consume annually?

 109.5

8. In doing an energy audit of a home you find that both the front and the back porches of the home have overhead light fixtures set on timers. Each porch’s light fixture contains two 40 W incandescent bulbs, and the timers turn the porch lights on for 8 hours every day. If the homeowner replaced the 40 W bulbs with equivalent 4.5 W LED bulbs, how much would the annual energy consumption be reduced in kWh?

 414.64

9. Use the following table for the next 2 questions

Consider the following section of a table from an energy audit in answering the next four questions:

Device Power (W) Device Count Hours of use per day (hours) Days used per year Annual energy (kWh/year)
Light bulbs 60 4 4 350 84
Air conditioner 820 1 8 90 590
Coffee pot 1100 1 .25 350 96
Television 60 2 5 250 150
There is an error in an annual energy calculation, which device’s annual energy value is incorrect?

• Air Conditioner
• Coffee pot
• Television
• Light bulbs

10. For the energy audit table in question 9, what is the correct annual energy value, in kWh, for the device with the calculation error?

 336

11. Use the following map of solar resource to answer the next 3 questions. You can also open the Solar Resource Map in a new window to get a larger version. Use the lowest value of the average annual insolation for your calculations.

Based on this insolation map and assuming an 80% system efficiency, how much energy would be produced annually at a home in South Carolina (SC) that has a 6 kW solar array?

 8760

12. Using the solar resource map from question 11, how many more hours of full sun per year would a house in Oregon (OR) located in the area with the highest insolation in the state get than a house located in the lowest insolation area in the Oregon?

• 1643 full sun hours
• 2008 full sun hours
• 1278 full sun hours
• 548 full sun hours
• 730 full sun hours

13. Using the solar resource map from question 11, how many full sun hours per day does Michigan (MI) receive on average.

 4

14. Use the following scenario for the next two questions.

A homeowner in Texas wants to install a solar array that will replace 60% of their annual electrical energy through PV generation. Your energy audit determines their annual load is about 13300 kWh per year, and their home is about as efficient as it can be. How much energy in kWh would need to be produced by the array to meet the homeowner’s target of 60%?Enter answer here

 7980

15.
Question 15
For the home in the previous question, what size array (in kW to the nearest tenth 0.1) would be needed to meet their target of 60% of their annual energy if their home receives 2008 full sun hours annually you assume an 85% system efficiency.

 4 .7

16. If you are designing a solar array to have an operating power target of 4.2 kW, and you have selected panels with a 260 W rating, how many panels do you need for the array? (Don’t exceed 4.3 kW system power)Enter answer here

 16