Spell effect on weapons

Madval

Hi there, I've allready asked this on french section but I haven't had many reply.

Do you know exactly what do spell effect on weapon. Like +15 fire, frost, etc...
I know that for exemple poison damage apply a dot but what do fire, frost, electricity, disease etc ?

Do fire apply a dot too or is it a pure damage ?
Do shock lower target armor or stun ?

Can't seem to find a guide explaining what's the effect of each spell on weapons.

Thanks.