Wireless chargers are very convenient, whether you're determined to minimize cord clutter or just tired of plugging in your phone every day. However, there's a hidden cost: your charger is wasting electricity, and that's costing you both money and time. There are times when that convenience might outweigh every other factor. However, it's sometimes better to find that USB cord. Here's why wireless charging is so wasteful, and when it makes more sense to go the wired route.