Question

exam lesson name: energy conversions
exam number: 700697rr
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question 9 of 20 :
select the best answer for the question.

1. electrical energy is generated by

○ a. the flow of electrons (charged particles) between positive and negative sources.
○ b. breaking chemical bonds between atoms and molecules.
○ c. splitting atomic nuclei in radioactive materials.
○ d. the internal heat within the earths core
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Explanation:

To determine how electrical energy is generated, we analyze each option:

• Option A: Electrical energy is indeed generated by the flow of electrons (charged particles) between positive and negative sources (like in a circuit with a battery, where electrons move from negative to positive terminals, creating current and electrical energy).
• Option B: Breaking chemical bonds (e.g., in a battery's chemical reaction) generates chemical energy that can be converted to electrical energy, but this describes the source of the electron flow, not the direct generation of electrical energy. The direct generation of electrical energy is the flow of electrons. Also, breaking chemical bonds is more related to chemical energy conversion, not the fundamental generation of electrical energy.
• Option C: Splitting atomic nuclei (nuclear fission) generates nuclear energy, which is then converted to electrical energy (e.g., in a nuclear power plant), but this is not the direct generation of electrical energy.
• Option D: The internal heat of the Earth's core is geothermal energy, which is used to generate electricity indirectly (e.g., by heating water to produce steam to turn turbines), but this is not the direct generation of electrical energy.

So, the correct answer is A as it directly describes the generation of electrical energy by electron flow.

Answer:

A. the flow of electrons (charged particles) between positive and negative sources.