My pc: GTX 1080, Ryzen 5 5600X and 1440p monitor
254W under stress test
1kwh =10p
=254+25
=279*24
=6696
=6.7kwh/day
In a yr=365*6.7
=2446*0.10
=£244.60 if the PC was on full load for a year
generic gaming pc, not mine

Raspberry pi 500: RISC (Reduced Instruction Set Computing) Acorn ARM architecture
12W on stress test
=12+25
=37*24
=888
=0.9kWh/day
In a year:0.9*24
=21.6 kwh
=21.6*£0.10
=2.16
£2.16 if the PC was on full load for a year
raspberry pi 500