2. If we wanted to supply a world of 10 billion people with an average demand of electricity at 1 kW per person, what surface area of photovoltaic arrays would be required? Compare this to the size of a known city, state or country.
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- 1. If electricity costs Php 4.50 per kw-hr, how much does it cost to use a 250 watt light bulb for 7 hrs? 2. A typical human consumes 2500 Kcal of energy during a day. Say you decided to run stairs all day. How much energy, in Joules, would you burn in climbing stairs all day?2- Q1. Explain the advantages and disadvantages of floating cylinder biogas plants.The newly appointed Government of a small island, depend on the import of fossil fuels to produce electricity, has the desire to invest in one or two renewable energy technologies. The advantage of the island is the number of different renewable energy potentials. The cost of electricity on the island is $0.39 kWh. 1) Using solar radiation photovoltaic technologies, it was estimated that 500 rooftops, with a total surface area of 456 000 m2 , will be available to install the photovoltaic panels. Assume that the solar panels actually cover 90% of the available surface area. Given, the size of a standard photovoltaic cell is 156 mm by 156 mm and for a silicon photovoltaic cell, each PV cell produces a current of 2.5 A at a voltage of 0.5 V. The average daily irradiance for the island is 185 W/m2 . Assume the initial capacity expenditure evaluated on a year basis of the photovoltaic system, that covers, 90% of the available surface area is US $600 000 and the annual operating cost is US…
- 2. At the beginning of 2006, the rate of energy consumption for the city of Denver was 7000 megawatts (MW), where 1 MW = 106 W. The rate was expected to increase at an annual growth rate of 2% per year. a) Find the function that gives the rate of energy consumption for all times after the beginning of 2006. b) Find the total amount of energy used during the year 2010. Note: the entire year 2010 corresponds to the interval 4 < t < 5.In Arizona, photovoltaic (PV) panels can generate an average annual power of 1 MW/acre. If there are 311 sunny days per year in Arizona, but only 160 sunny days per year in Pennsylvania, how much average power (in MW/acre) could the same PV panels generate in Pennsylvania? Please include two decimal places in your answer. Note: assume that a cloudy day delivers 0 watts/acre of solar power. This is not true, but it simplifies the problem for us.The biggest drawback to extensive use of photovoltaic cells is they produce DC electricity. they don’t work well in cold climates. they are expensive to manufacture. they kill bats and birds. 2. Wind turbines are made to be very tall. This is because they are more stable when they are taller. the wind blows faster higher up. they are quieter the higher up they are. they are safer the higher up they are.
- 9. A fitness club hires you to talk to their clients about the biomechanics of exercise. One of the clients likes to walk stairs at her office during her lunch hour for exercise. She wants to know if she can burn off the calories from one candy bar (180 kilocalories) by climbing up 1,500 steps of stairs. One kilocalorie equals 4,184 Joules. She weighs 65 kg and the height of one stair is 20 cm. The gross efficiency of her positive work is 25%.The newly appointed Government of a small island, depend on the import of fossil fuels to produce electricity, has the desire toinvest in one or two renewable energy technologies. The advantage of the island is the number of different renewable energypotentials. The cost of electricity on the island is $0.39 kWh.1) Using solar radiation photovoltaic technologies, it was estimated that 500 rooftops, with a total surface area of 456 000 m2 will be available to install the photovoltaic panels. Assume that the solar panels actually cover 90% of the available surface area. Given, the size of a standard photovoltaic cell is 156 mm by 156 mm and for a silicon photovoltaic cell, each PV cellproduces a current of 2.5 A at a voltage of 0.5 V. The average daily irradiance for the island is 185 W/m2. Assume the initial capacity expenditure evaluated on a yearly basis of the photovoltaic system, that covers, 90% of the available surface area is US$600 000 and the annual operating cost is US $5…The average solar radiation per day in Cincinnati in the month of December is 2.5 kWh/m²/day. The average energy usage for a typical household in Cincinnati is 33 kWh/day. Assuming solar panels are 20% efficient and have an area of 1.6 m², how many solar panels would be needed to provide enough energy for a typical household in Cincinnati. Use the problem presentation method to solve this problem (except the verification step).
- The average electricity consumption of a house in Gainesville is known to be 1,007 kWh in a month (One month = 30 days). They would like to install solar panels of 29 % efficiency to generate this electricity. Given that the average solar power density in Gainesville is 5.47 kWh/m2/day, how much surface area must the panels occupy? Calculate the result in m2 but do not write the unit. Round off %3D you answer to a whole number (zero decimal place.)1. A typical tablet battery recharger provides 10 Watts of power. 60% of this power is converted to chemical potential energy of the battery while the rest is lost as heat. When filled, the rechargeable battery can hold 45,000 Joules of chemical energy. How long does it take to completely charge the drained battery?8. Shaming of flying: is it fair? We are seeing in recent years the shaming of flying. The reasoning is that a plane uses a lot of fuel in each flight. For example, as presented in class, a Boeing 737MAX burns 1.6 gallons of jet fuel for each mile in cruise. Explain if such shaming is justified in the overall picture of energy consumption and CO2 emission.