【Daily Question】Utilities - Mechanical & Electrical - 20200429
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Applying the law of conservation of energy to processes of energy conversion and transfer accompanied by thermal phenomena yields the first law of thermodynamics, which states the conservation of energy between thermal energy and mechanical energy during transmission or conversion. Based on this, an energy equation is established; the general form of such an energy equation is ( ). A. Energy input to the system – Energy output from the system = Energy stored in the system B. Energy input to the system – Energy output from the system = Increase in energy stored in the system C. Energy input to the system – Energy output from the system = Increase in energy stored within the system D. Energy input to the system – Energy output from the system = Energy stored outside the system Answer: B
B. System energy input – system energy output = increase in system stored energy