Yes, lightning produced by magic would carry the same properties as lightning from storms, so it may be used to power electronics for up to 1 hour at a time. Each device powered will consume an amount of mana, however, so Add will also need to recharge himself if he's using it often!

The world doesn't have much of an understanding of magnetism yet, so attempting to use or create magnets will have unpredictable results: it may work perfectly sometimes, but it may also fail to work at all, work too well, or work in ways that seem correct at a glance but don't actually make sense.