Al as usual gave a wonderful answer
To view it a bit differently think of electricity or power as water and your electronics as living creatures needing it.
Believe it or not there are only 5 water systems in the U.S. that do not need or are required by state or national standards to use chlorine or other items to clean the water(New York City and San Francisco are two of them). When you don't have to spend time getting things cleaned up so that water can be used it is more energy efficient and easier on all around. Power works the same, when it is cleaner either by power cords, conditioners, magic, or whatever everything flows much more easily and the electronics can finally do the job they were designed for with ease.
To view it a bit differently think of electricity or power as water and your electronics as living creatures needing it.
Believe it or not there are only 5 water systems in the U.S. that do not need or are required by state or national standards to use chlorine or other items to clean the water(New York City and San Francisco are two of them). When you don't have to spend time getting things cleaned up so that water can be used it is more energy efficient and easier on all around. Power works the same, when it is cleaner either by power cords, conditioners, magic, or whatever everything flows much more easily and the electronics can finally do the job they were designed for with ease.