Tablets and laptops are slapped together with traditional desktop PCs in the "desktop" category, which specifies Windows 10 desktop devices need UEFI 2.3.1 firmware with Secure Boot enabled, 2GB at minimum for the 64-bit version (only 1GB for 32-bit), over 20GB of storage capacity for the 64-bit version (16GB for 32-bit) and a graphics card or integrated graphic with DirectX 9 support.
Consumer versions of Windows require a screen size of 8" while 7" is the limit for the Pro version. In both cases the screen needs a minimum of 800 x 600 pixels, something you hopefully never come across in this day and age.
Other than this Windows 10 has the same system requirements at Windows 8.x. The processor for instance needs to be a 1GHz or better model with support for PAE, NX, and SSE2 instructions.
If you're also interested in learning about the hardware requirements for Windows 10 mobile phones you can read that information at PC World.