2025 HVAC Level 2 Alternating Current Module Practice Test

The primary source of electricity produced by public utilities has historically been coal-fired power plants. These plants burn coal to generate steam, which drives turbines connected to generators, producing electricity. This method has been a cornerstone of power generation for many years due to the abundance of coal reserves, particularly in certain regions, and the technology developed for efficiently converting coal energy into electrical energy.

While renewable energy sources like wind and solar have been growing rapidly in recent years and nuclear power provides a significant amount of electricity with low greenhouse gas emissions, coal-fired plants still represent a substantial portion of the energy mix, especially in areas where renewable sources are not yet fully integrated or where economic factors favor coal due to lower operational costs. Despite a gradual shift towards cleaner energy, coal remains a critical component of the energy landscape due to its historical prominence and established infrastructure.