発熱

1. Origins, structure, and basic meaning

• Structure: 発熱 (はつねつ) is a noun that also forms a する verb for heat generation or developing a fever.
• Basic usage: It applies both to a machine producing heat and a person becoming feverish.
  • 機械の発熱が強いため電源を切った。 — The machine generated so much heat that we turned off the power.
  • 物語の子どもは夜に発熱して学校を休んだ。 — The child in the story developed a fever at night and missed school.

2. Common pitfalls and similar expressions

• Generated heat and fever
  • With a machine, 発熱 is heat generation; with a person, it describes an elevated body temperature or fever.