This is the 4719th most frequent German word.
wechselte
"Wechselte" means "changed" or "switched" (past tense of "wechseln").
The verb 'wechselte' here implies replacing something, specifically 'changing' the light bulb in this context.
Er wechselte die Glühbirne im Wohnzimmer.
He changed the light bulb in the living room.
The verb 'wechselte' in this example indicates switching affiliation, in this case changing from one team to another.
Die Fußballspielerin wechselte in der Pause die Mannschaft.
The soccer player changed teams during the break.
Here, 'wechselte' is used to describe a transition, indicating a shift in states or conditions, specifically the weather.