An electric motor converts 1,000J of electrical energy into 900J of work as it p

Question

An electric motor converts 1,000J of electrical energy into 900J of work as it pumps water from a flooded basement to the ground above. Which of the following statements best describes the energy analysis of this situation?

A. Approximately 10 percent of the electrical energy is converted into heat by increasing the random kinetic motion of the molecules in the environment

B. Approximately 90 percent of the electrical energy is converted into elastic potential energy by increasing the intermolecular forces between the water molecules

C. Approximately 90 percent of the electrical energy is converted into chemical potential energy by decreasing the entropy of the water

Explanation / Answer

A. as the water is raised, the molecules start traivelling with some speed and having collisions during the motion. these collisions results in heat energy dissipation. the energy lost is 1000 - 900 = 100 J   which is just 10% of the total electrical energy available.

so A. Approximately 10 percent of the electrical energy is converted into heat by increasing the random kinetic motion of the molecules in the environment

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