Flashcards on Work, Energy, and Power
Work, Energy, and Power: A Comprehensive Student Guide
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Energy: Heat Engines
16 cards
Card 1
Question: Why can't all thermal energy be converted into useful work in a heat engine?
Answer: Because thermal energy is the energy of random particle motion and tends to spread out; as it disperses, it becomes less concentrated and less useful
Card 2
Question: What does it mean for thermal energy to 'spread out,' and why does this reduce its usefulness?
Answer: It means the energy is distributed among more particles and over a larger volume; as it disperses, the same amount of energy creates a smaller tempera
Card 3
Question: Give an example that illustrates how the dispersion of thermal energy makes it less useful.
Answer: Energy concentrated in a hot flame can generate steam for a turbine, but if that same energy is distributed throughout a large body of water, it will
Card 4
Question: What are 'district heating' systems in relation to a thermal power plant?
Answer: These are systems that collect unused heat from a power plant using hot water pipes to warm nearby homes, offices, and factories, utilizing energy tha
Card 5
Question: Why might a power plant operate with lower efficiency to facilitate district heating?
Answer: Because by slightly lowering efficiency, hotter water can be produced, which is more useful for supplying heat to the urban network.
Card 6
Question: In a combined cycle gas turbine power plant, how are the two sources of electricity generation obtained?
Answer: First, gas combustion drives a jet-engine-type turbine that spins a generator; then, the hot exhaust gases are used to produce steam, which powers a s
Card 7
Question: List four different types of fuel used in thermal power plants (according to the provided content).
Answer: The content asks to list fuels; examples mentioned in the material include: natural gas (in combined cycle), coal (plant X is coal-fired), nuclear fue
Card 8
Question: In a thermal power plant, what is the produced steam used for?
Answer: The steam is used to drive the turbines, which spin the generators to produce electricity.
Card 9
Question: What is the function of cooling towers in a thermal power plant?
Answer: To remove excess heat (disperse thermal energy not converted into work) by cooling and condensing the steam to recycle it through the cycle.
Card 10
Question: According to the given table, where is most of the energy wasted in power plants X and Y?
Answer: The greatest loss occurs in the turbines: 2900 MW in plant X and 3800 MW in plant Y.