Technically, yes, if by "power" you mean your energy. Your energy can be shared with a person during ritual or spell work. But it's not recommended to do it too often or with too many people.
Your friend should want to protect himself and shouldn't get into the habit of borrowing people's powers to perform magickal workings. If you want to give him a gift like a talisman or gemstones (bloodstone, tourmaline, onyx, Apache tear), that would be a lovely gift.