What You Need To Know About Energy
What do you know about energy?
Refrigerators became 70% more efficient between 1972 and 2001, primarily due to regulation. What is a market response to increased efficiency of refrigerators?
- People use their refrigerator more hours in the day.
- People use their refrigerator fewer hours in the day.
- People keep more refrigerators in their house.
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Sorry, that’s incorrect.
Refrigerators are not likely to be used more or less hours in the day, but people are more likely to have more of them if they cost less to operate.
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Sorry, that’s incorrect.
Refrigerators are not likely to be used more or less hours in the day, but people are more likely to have more of them if they cost less to operate.
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Correct!
Refrigerators are not likely to be used more or less hours in the day, but people are more likely to have more of them if they cost less to operate.
Which of the following is considered an obstacle to cars running on hydrogen fuel cells?
- Cost of fuel cells
- Difficulty storing and transporting hydrogen
- Process of collecting pure hydrogen
- All of the above
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Sorry, that’s incorrect.
All of the reasons mentioned are considered obstacles to producing cars that run on hydrogen fuel cells.
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Sorry, that’s incorrect.
All of the reasons mentioned are considered obstacles to producing cars that run on hydrogen fuel cells.
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Sorry, that’s incorrect.
All of the reasons mentioned are considered obstacles to producing cars that run on hydrogen fuel cells.
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Correct!
All of the reasons mentioned are considered obstacles to producing cars that run on hydrogen fuel cells.
The consumption of energy in the United States is projected to rise by how much between 2013 and 2040?
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Sorry, that’s incorrect.
U.S. energy consumption is projected to rise 9% by 2040, or 0.3% per year, while global consumption will increase about 50% over the same period
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Sorry, that’s incorrect.
U.S. energy consumption is projected to rise 9% by 2040, or 0.3% per year, while global consumption will increase about 50% over the same period
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Correct!
U.S. energy consumption is projected to rise 9% by 2040, or 0.3% per year, while global consumption will increase about 50% over the same period
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Sorry, that’s incorrect.
U.S. energy consumption is projected to rise 9% by 2040, or 0.3% per year, while global consumption will increase about 50% over the same period
If electricity production wastes between 40 and 65% of the primary energy source, why is it used?
- Producing electricity is a way to store energy.
- Electricity production results in no harmful emissions.
- Electricity is a versatile energy carrier.
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Sorry, that’s incorrect.
Most direct uses of primary energy are limited to generating heat and motion. Electricity, by contrast, is extremely versatile, with a wide range of complex applications.
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Sorry, that’s incorrect.
Most direct uses of primary energy are limited to generating heat and motion. Electricity, by contrast, is extremely versatile, with a wide range of complex applications.
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Correct!
Most direct uses of primary energy are limited to generating heat and motion. Electricity, by contrast, is extremely versatile, with a wide range of complex applications.
What technology was most responsible for increase in lighting efficiency from 45 Im/W in 2001 to 58 Im/W in 2010?
- Increase in efficiency of incandescent light bulbs
- Increase in efficiency of candles
- Increase use of compact fluorescent lights
- Increased use of LED lights
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Sorry, that’s incorrect.
Increasing market share of compact fluorescents was primarily responsible for the increased lighting efficiency between 2001 and 2010.
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Sorry, that’s incorrect.
Increasing market share of compact fluorescents was primarily responsible for the increased lighting efficiency between 2001 and 2010.
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Correct!
Increasing market share of compact fluorescents was primarily responsible for the increased lighting efficiency between 2001 and 2010.
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Sorry, that’s incorrect.
Increasing market share of compact fluorescents was primarily responsible for the increased lighting efficiency between 2001 and 2010.
On average, which is most efficient in coverting heat into electic power?
- Coal boiler power plant
- Natural gas-fired turbine power plant
- Natural gas combined-cycle power plant
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Sorry, that’s incorrect.
On average, a typical coal-burning power plant in 2013 was about 33% efficient in converting heat energy into electrical power. A gas-fired plant was about 42% efficient. And in natural gas combined-cycle power plants—in which waste heat from a natural gas turbine is used to power a steam turbine—generation may be as much as 60% efficient.
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Sorry, that’s incorrect.
On average, a typical coal-burning power plant in 2013 was about 33% efficient in converting heat energy into electrical power. A gas-fired plant was about 42% efficient. And in natural gas combined-cycle power plants—in which waste heat from a natural gas turbine is used to power a steam turbine—generation may be as much as 60% efficient.
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Correct!
On average, a typical coal-burning power plant in 2013 was about 33% efficient in converting heat energy into electrical power. A gas-fired plant was about 42% efficient. And in natural gas combined-cycle power plants—in which waste heat from a natural gas turbine is used to power a steam turbine—generation may be as much as 60% efficient.
Which of the following sources do experts expect will provide us with the “silver bullet” solution to our energy needs?
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Sorry, that’s incorrect.
There is no silver bullet. Tomorrow’s energy, like today’s, will come from a variety of sources.
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Sorry, that’s incorrect.
There is no silver bullet. Tomorrow’s energy, like today’s, will come from a variety of sources.
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Sorry, that’s incorrect.
There is no silver bullet. Tomorrow’s energy, like today’s, will come from a variety of sources.
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Correct!
There is no silver bullet. Tomorrow’s energy, like today’s, will come from a variety of sources.
Which residential usage consumes the largest amount of energy?
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Sorry, that’s incorrect.
Consuming the largest amount of energy, space heating accounts for 31% of all residential energy used. Space cooling accounts for an additional 12% of energy usage.
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Sorry, that’s incorrect.
Consuming the largest amount of energy, space heating accounts for 31% of all residential energy used. Space cooling accounts for an additional 12% of energy usage.
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Correct!
Consuming the largest amount of energy, space heating accounts for 31% of all residential energy used. Space cooling accounts for an additional 12% of energy usage.
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Sorry, that’s incorrect.
Consuming the largest amount of energy, space heating accounts for 31% of all residential energy used. Space cooling accounts for an additional 12% of energy usage.
True or false? Fuel cells store energy.
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Sorry, that’s incorrect.
Fuel cells are an efficient way to convert hydrogen to electricity, but the energy is stored in the hydrogen.
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Correct!
Fuel cells are an efficient way to convert hydrogen to electricity, but the energy is stored in the hydrogen.
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