system
Given the following post, respond as if you're commenting on Reddit:
human
Why do higher resolutions require more power?

Stupid Question and this might be more related to hardware: Why are things more intensive when you change the resolution? For example, if you have a 1920x1080 monitor, then your screen is constantly showing 2073600 pixels right (unless there's a letterbox)? I don't get how changing the resolution affects the amount of power the monitor needs (or GPU).
gpt
Because the complexity of basically every single rendering algorithm (2d/3d rasterization/3d Ray traced) is a function of the amount of pixels being drawn. The RGB value of every single pixel needs to be set (and calculated) independently by the GPU. If you want to draw a green triangle, a function has to be run for every single pixel to find out wether or not that pixel is inside the triangle. The more pixels, the more times this function needs to be run. 

Note that your GPU calculates hundreds/thousands of pixels simultaneously (and does other calculations by mass parallelisation). Still, it can't calculate all the pixels in parallel. The more pixels, more time the GPU will take to calculate their color values.