The game itself will tell you in a loading screen that Ice type enemies are weak to Fire. General consensus seems to be that hitting an Ice elemental enemy (e.g. Ice Keese) with a Fire element weapon will do around 10 times the normal damage. This also seems to work the other way around, hitting a Fire element enemy with an Icy weapon will do 10 times damage.
However, the one I'm not sure on is Electric element enemies. Are they weak to electric themselves? Or do they simply take regular damage from everything?
Best Answer
As far as I have seen from looking around online it appears as though lightning is not inherently weak to anything, nor is it stronger vs any particular type.
This article confirms what you said about ice vs fire match ups, along with their bonuses to general enemies. For lightning weapons however, they simply mention:
There is no mention of bonuses vs other elemental types, or any mention of lightning weaknesses. So I think it's safe to assume you are right in saying they simply take regular damage from everything.