使用中的电源适配器会有发热的情况，其实是很正常的现象，因为它在转换电压

使用中的电源适配器会有发热的情况，其实是很正常的现象，因为它在转换电压的过程中会消耗能量，而一部分的能量会转换成热能散发出来。

Results (English) 1:

In the case of using the power adapter will have fever, in fact, is quite normal, because it will consume energy in the process of converting voltage, and a portion of the energy is converted into heat comes out.

Results (English) 2:

The power adapter in use has a heating condition, which is actually normal because it consumes energy during the conversion of voltage, and a portion of the energy is converted into heat.

Results (English) 3:

The power adapter in use will generate heat, which is actually a very normal phenomenon, because it will consume energy in the process of voltage conversion, and part of the energy will be converted into heat energy to emit.