Which of the following is not listed as an energy source for mechanical systems?

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Multiple Choice

Which of the following is not listed as an energy source for mechanical systems?

Explanation:
In mechanical systems, energy sources are what directly supply usable energy to drive the system. Electricity, natural gas, and solar can provide that energy—electricity powers equipment, natural gas is burned to produce heat, and solar can generate power or heat. Water, however, is a working fluid used to transfer or store energy within the system (for example in hydronic heating or cooling) rather than provide the energy itself. The energy in a water-based system comes from another source (like a boiler or a solar collector) that heats or pressurizes the water. So water is not listed as an energy source.

In mechanical systems, energy sources are what directly supply usable energy to drive the system. Electricity, natural gas, and solar can provide that energy—electricity powers equipment, natural gas is burned to produce heat, and solar can generate power or heat. Water, however, is a working fluid used to transfer or store energy within the system (for example in hydronic heating or cooling) rather than provide the energy itself. The energy in a water-based system comes from another source (like a boiler or a solar collector) that heats or pressurizes the water. So water is not listed as an energy source.

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