The power rating of a mobile device power adapter, measured in watts, indicates the rate at which electrical energy is transferred to the device. For example, a 20-watt adapter can deliver electrical energy at a faster rate than a 5-watt adapter, potentially reducing charging time.
Selecting an adapter with an appropriate power rating is crucial for optimal charging efficiency and device longevity. Historically, lower wattage adapters were standard, but advancements in battery technology and faster charging protocols have led to the development and widespread adoption of higher wattage adapters. These advancements allow for quicker replenishment of battery capacity and can extend the useful lifespan of portable electronics.