Mains supply in Sweden: 230 V, 50 Hz, sockets of Types C and F. At 230 V the supply matches what UK and European appliances expect, so no converter is needed.
Handy for multi-stop trips: Türkiye, Latvia, Luxembourg and Norway use the same plug types. Watch out when moving on: Malta, the Isle of Man and Cyprus use a completely different system. Across Europe this setup is common: 31 of 50 countries.
Protective earth
Grounded and ungrounded sockets may occur
Sweden has sockets with a protective earth (Type F) and without (Type C). A plug that fits mechanically does not guarantee earthing.