Dragons are hard on Adept difficulty for my Breton pure mage, if only because he runs out of magicka and potions and the dragons still standing so his only option is really to run away screaming "FFFFFUUUUU-" until he gets magicka back. It is not a fun existence.
Oh, well... you have to find shelter, even a rock is sufficient if you can go from once side to the other. I summon a fire atronach to attack the dragon, it also diverts it's attention from you and it makes it easier to track the dragons movements (by monitoring the direction the atronach is looking).
I have the perk that apprentice conjuration spells only cost half the casting cost, so I have plenty of spare power for other spells without having to rely on potions.