It is those fancy colored electronic components.
They convert electric current, (flow of electrons) to voltage or vice versa.
For example the anode load resistor connected to a vacuum electron tube converts the amplified dance of electrons to music to a corresponding varying music signal voltage.
Resistors resist electric current, ie the flow of electrons, because electrons collide with atoms.
The hotter a resistor is the more the thermal movement of molecules. The more there is a chance of collision, the more resistance.
Electrons colliding with the molecules pass on to them energy. So they obtain an increased thermal motion. Thus means the temperature has increased.
References:
Foundations of Wireless or Techique de la radio - Scroggie - Iliffe, éditions radio
Electronics, a systems approach - Neil Storey
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