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Anonymous
timer Asked: Dec 12th, 2018
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please answer each question including Multiple choices, calculation, and energy conversions. if you are not sure correct or not, you can bold the question and answer.

A pumped storage system uses a pump with an efficiency of 69% to fill the reservoir and turbine with an efficiency of 83% to produce power from the filled reservoir. What is the overall (round trip) efficiency of the pumped storage system? Give your answer in %. The electric grid consists of many interconnected parts which create a complex network. In the transmission portion of the grid electricity is ____________. carried to end users generated for consumption transmitted at low voltage transmitted at high voltage Nuclear reactions generate much more energy per reaction than chemical reactions. This is because nuclear reactions ____________. involve the nuclei of atoms and transform energy to mass involve the nuclei of atoms and transform mass to energy involve the electrons of atoms and transform mass to energy involve the electrons of atoms and transform energy to mass Which event most accurately describes the conversion of radiant energy to electrical energy? The burning of gasoline to move a car. The burning of wood to heat a room. The harvesting of wind using a turbine. The conversion of sunlight in a photovoltaic cell. One statement of the second law of thermodynamics is that ___________________. heat can flow spontaneously only from a hot source to a cold source a heat engine can convert all the heat input to useful work heat can flow spontaneously from a cold source to a hot source energy can be created and destroyed Water is being cooled to decrease its temperature by 25oC. Which situation requires the most cooling? Cooling from 75oC to 50oC. Cooling from 120oC to 95oC. Cooling from 50oC to 25oC. There is no difference as it is a 25oC drop in each case. Cooling from 150oC to 125oC. Enzymes are used in the production of ethanol from corn for ____________. converting starches in the corn into sugars purifying alcohol before distillation releasing carbon dioxide from the fermented corn converting sugars to alcohol Which of the following best describes "current" in the context of electricity? The material property that inhibits electricity flow in a wire. The parameter measured in units of "ohms". The parameter measured in units of "volts". The driving force for electrical flow. The movement of electrons. The energy conversions that take place in a wind turbine generating electricity are _______. kinetic energy of the wind to potential energy of the turbine blades and shaft to electrical energy in the generator potential energy of the wind to potential energy of the turbine blades and shaft to electrical energy in the generator chemical energy of the wind to kinetic energy of the turbine blades and shaft to electrical energy in the generator kinetic energy of the wind to kinetic energy of the turbine blades and shaft to electrical energy in the generator Solar photovoltaic panels use ____________ to collect solar energy and convert it to electricity. inverters mirrors semiconductor materials heliostats transformers

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Owen_Carter
School: Cornell University

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Anonymous
Tutor went the extra mile to help me with this essay. Citations were a bit shaky but I appreciated how well he handled APA styles and how ok he was to change them even though I didnt specify. Got a B+ which is believable and acceptable.

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