He likes to delve into the car, he must have seen these "things" - relays that control the functioning of electrical devices in the car. For example, headlights, a fan, an engine cooling radiator, a rear window defroster, a signal and other systems. Devices connected to a relay have one common “theme”: a relatively large current consumption.
And why connect these products through a relay? Is it not possible directly? Can. However, there is one "but". You will need wires of the appropriate thickness so that the insulation does not melt. Plus, serious switches with a large contact area, so as not to burn. Can you imagine what will happen in the salon then? Dimensional buttons and thick bundles of wires ...
On the Denis MEKHANIK channel, the author clearly shows what happens if you connect powerful consumers directly, without a relay. In short, such home-made is fraught with fire (in the worst case). Why study all this? For example: you love to equip your car with additional devices and decided to install “foglights”. And how to connect a relay, without which the wires will heat up, or even burn out (along with the button)? Watch the video! The same applies to the forced turning on of the fan: such devices are installed when the car has to constantly drive in the heat or for safety, if the standard sensor, the relays do not work (that is, it will be like on an airplane - everything is reserved!). And if you want to listen and see how regular relays are still used, the video is at your service.
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