Why do laptop fans go out but not PC fans?

Yes, the question is above because in PCs the fan only runs permanently at a regulated speed, but with laptops it often goes out too. How so?

Because laptops with little or no load often do not emit as much heat.

Incidentally, on PCs you can often set the fans so that they don't go on up to 50 degrees Celsius, for example, and some graphics cards also have a "0-RPM" mode.

That is a question of the controller setting. With some desktop PCs, depending on the temperature to be regulated, you can also have the fan switched off completely by the control.

It is usually not necessary because the larger fans in the PC are quieter and you sit further away from the fans. And since it doesn't bother and the small amount of power consumption is also irrelevant, …

Both are different with a laptop.

Actually, these do not go out in the most extreme case when the laptop battery has to save then it can be that it goes off and comes on again from a certain temperature, but the power consumption of a tower pc does not matter it is emptied faster if it runs continuously but the fan on the charging cable does not go out completely, even on my laptop

Simply put; Laptop has a battery, pc a power supply, but as mentioned everything can be set with programs.