On: Letters of a Radio-Engineer to His Son (1922)

[mikermcneil]

“Why does it get hot? Because when the electrons stream through it they bump and jostle their way along like rude boys on a crowded sidewalk. The atoms have to step a bit more lively to keep out of the way.”

[jasperpilgrim → mikermcneil]

I can be a bit dense sometimes, and the imagery helps me to grasp the concept. Fortunately, the book is packed full of descriptions like this.