The contrast between 30W wireless and wired heating mainly lies in the different ways of energy transmission. Wired transmission is the transmission of electrical energy through the wire, so there will be a certain amount of energy loss and heat generation during transmission, so there will be a certain amount of heat when using wired transmission.
Wireless transmission is the transmission of energy through electromagnetic waves, so there will be no energy loss and heat generation during transmission, so there will be no obvious heating phenomenon when using wireless transmission. However, because wireless transmission requires the use of certain electronic devices to convert electrical energy and electromagnetic waves, these devices will also produce a certain amount of heat, but it will be smaller than that of wired transmission.
For mobile phones?? Wire charging is less hot than wireless charging! Wireless charging the whole phone is hot!