major power voltage and current system
Note :110 Vac / 220 Vac some country use 110V ac and some country use 220V most of devices nowaday can use both voltages; except when you bought them in USA and Japan both used only 110Vac devices
12 Vdc and battery: most usages came from car, motorbike battery standardized (sometime for large truck 24Vdc) recommended for all devices that need adapters. you can find this very easy than other voltages.
UPS and ac current: in case you don’t know; all UPS use battery, same type as your car or motorbike. so the voltage came as 12Vdc. when you use ac current on UPS it converts dc it’s store to ac. and in the same time when you charge UPS via power plug, convert from ac to dc.
USB powered (5Vdc): many devices for now use USB as power plug. the standard of USB may talk about later.
Solar cells ( per cell 0.5-0.6 Vdc) usually serial the cell to voltage about 13-18 for charging battery and then convert to ac for normal usages.
power surge, lightning strike and other power failure: before planning usage on each devices, check how sensitivity of devices may needed
some with cross in it.