At this point we are moving from the section on sound (waves that move through air at 330 m/s) toward the section on light (waves that move through a vacuum at 300 million meters/sec). In between there is a very interesting and important section on electricity and magnetism. (Light is a wave involving electricity and magnetic fields.)
Suggested reading starts with chapter 22, especially emphasizing the parts on Coulomb's law, electric potential energy, and electric energy storage. After that we will cover chapter 23, including electric current, circuits...
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