20. the most common method of producing electricity is ___.\na. chemicals\nb. friction\nc. magnetism\nd. light
20. the most common method of producing electricity is ___.\na. chemicals\nb. friction\nc. magnetism\nd. light
Answer
Brief Explanations:
In power - generation, electromagnetic induction based on magnetism is widely used in power plants. For example, in thermal, hydro, and nuclear power plants, turbines rotate magnets relative to coils to produce electricity. Chemicals are used in batteries for small - scale power, friction is not a common large - scale electricity production method, and while light can be used in photovoltaic cells, magnetism is more common for large - scale electricity generation.
Answer:
c. magnetism