Hi,
How do I recharge the Sword of Sparks and the Greatsword of Ice? Thanks!

are these just normal enchanted weapons? If so, you need to get a charged soul gem. These can be found while adventuring, or bought from mages (like the one in Dragonsreach). Alternatively, you can charge a soul gem yourself by casting the spell "soul trap" on creatures before killing them, or using weapons with the soul trap enchantment. Once you have a charged soul gem, go into your inventory, and highlight the weapon you want to charge. On pc, you press "t" to charge, this will obviously be different on consoles. You are then given the choice of what soul gem you want to use. Hope this helps...

You have to have filled soul gems.

Weapons have a number of "charges," and, for example, each hit with a sword will cost a charge. Armor that you enchant requires a soul gem to put the enchant on it, but does not require additional soul gems to keep the enchant active - armor doesn't have "charges" in the enchant.

When you make your own enchants, your enchanting level and the soul gem you use will determine how much damage each charge deals, or how high the percentage is on an armor enchant (i.e., if you add a health enchant to a piece of armor, it may say health increased 20 points, but if you use a higher level gem, it may go up to 30 or 40).

Good luck.