If you are saying to take it out of a laptop and put it in a desktop computer, then no. Laptop processors (as far as I have seen) are soldered into the motherboard, and designed only for motherboards for laptop sizes. Which in that case, it isn't possible to use a laptop processor in a desktop PC.
Laptop processors are designed to use less power and create less heat than desktop processors.
less
If the same processor is installed on both a laptop and a desktop, then the each of the processors will use the same amount of power. But, usually, in computer companies don't put more powerful desktop processors into their laptops, they usually use a less powerful processor, which would less power than the average desktop processor.
nothing
No. The processor in any computer is engineered for the particular motherboard. It is unlikely that the desktop and laptop processors will be compatible.
NO
Generally, a laptop processor should NEVER generate more heat than a desktop processor. That is because a laptop processor uses less power, hence the heat generated would be lesser.
At the same speed they likely use similar power, but as dissipating heat is easier in desktop it is more likely to use faster higher power processor.
A desktop processor is a processor that has been optimized for maximum performance on the desktop, for tasks such as playing video games or editing video. This is as opposed to a laptop / mobile processor, which is optimized to provide longer battery life and run cooler.
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Yes, there are some "no name" laptop brands that use desktop CPU-s onto their laptop motherboards. I have a laptop of "Vobis" manufacturer and I'm using Pentium 4 , 2.4 GHz, 533 MHz FSB desktop CPU in that machine.
A desktop processor usually uses more power than an equivalent laptop processor. Usually manufacturers make processors specifically for laptops and these processors are optimized to reduce their power consumption and heat output.