GU10s run on 240v which is exactly the same as your mains electricity, this means you can plug in and go without any hassle. MR16s run on 12v, this means they require a transformer to change the 240v to 12v.
Description
Specification
LED GU10s are typically available in options ranging from 1.8W to 11W. A GU10 LED 5W bulb in cool white would be roughly the equivalent of a 50W halogen.