The pad senses when a phone is on it and turns on the field. The pad uses a small amount of energy when not in use, however in modern wireless systems this "off" power is very small compared to the power used when charging. Hoffman, Chris (15 вересня 2017). How Does Wireless Charging Work?. How-To Geek. How-To Geek LLC. Процитовано 11 січня 2018.
