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What is photovoltaic (solar) cell ? How does it work ?
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- 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.How can a solar dish be used to produced electricity? a. Put solar cells b. Connect to the grid c. Connect to a stirling engine and a generator d. Connect to a battery Clear my choiceQ5 / (jA) Define a photovoltaic cell, explain its working principle, with the materials used in its manufacture, and draw an electrical circuit with a characteristic diagram Its current and voltage
- At a certain location, the solar power per unit area reaching Earth’s surface is 200 W/m2, averaged over a 24-hour day. If the average power requirement in your home is 3 kW and you can convert solar power to electric power with 10% efficiency, how large a collector area will you need to meet all your household energy requirements from solar energy? (Will a collector fit in your yard or on your roof?)Here is an extract from our electricity bill. The coloured text has been added to highlight the rate, with the 'rate' being the price per kW.hr: We buy electrical energy at ENERGY RATE COST USED 92 Days 294.3 kWh 24.9000c $73.27 ENERGY PURCHASED RATE CREDIT (03/12/13 - 04/03/14) 92 Days 6.6000c 883.4 kWh $58.30 but we sell them (solar) electrical energy at Over the 92 days of this bill, what is the average rate at which the company supplied energy to this household? P = Watts. (Take the 92 days as 2 significant figures: the electricity meter is read by an employee whose time of reading could be at any time during the day.) Also, don't give an answer, but think about how many 'labourers' (using the example in the lesson) we would need to employ to provide energy at this average rate.5. How many Joules of energy is in one kilowatt hour? Our classroom has about 20 lights, each with 50 W power rating. How many hours could a generator operating at 100% efficiency supply this power from one gallon of gasoline? If the generator operated at a realistic efficiency of 20%?
- Question 1: Choose the correct answer by writing A, B, C, or D. 1. A nuclear power station converts : A. Chemical energy to electrical energy B. Mechanical energy to electrical energy C. Heat energy to mechanical energy D. Heat energy to electrical energy 2. A steam turbine coverts : A. Chemical energy to electrical energy B. Mechanical energy to electrical energy C. Heat energy to mechanical energy D. Heat energy to electrical energy3. Write your understanding about the Solar flat plate collectors and Solar evacuated tubes. Clearly mention the difference in the working principle and choose which is best suitable for Oman.Some energy is lost in every energy conversion. Explain the meaning of this statement. (Direct your response to answering the question: Is it really lost? If not, what then?)
- How much energy would you consume daily if you kept 3 lightbulbs of 25 watts on all day long?.A light bulb transfers 80% of electrical energy into light energy, and 20% into heat energy. Is this an efficient light bulb? Why?(a) Calculate the power per square meter reaching Earth's upper atmosphere from the Sun. (Take the power output of the Sun to be 4.001026 W.) (b) Part of this is absorbed and reflected by the atmosphere, so that a maximum of 1.30 kW/m2 reaches Earth's surface. Calculate the area in km 2 of solar energy collectors needed to replace an electric power plant that generates 750 MW if the collectors convert an average of 2.00% of the maximum power into electricity. (This small conversion efficiency is due to the devices themselves, and the fact that the sun is directly overhead only briefly.) With the same assumptions, what area would be needed to meet the United States' energy needs (1.051020J) ? Australia's energy needs (5.41018J) ? China's energy needs (6.31019J) ? (These energy consumption values are from 2006.)