What is a key feature of wireless charging systems?

A key feature of wireless charging systems is the absence of physical connectors, which is precisely why the option highlighting this characteristic is the correct choice. Wireless charging utilizes electromagnetic fields to transfer energy between the charger and the device, allowing electric vehicles (EVs) to charge without the need for plugging in. This method not only simplifies the charging process but also enhances convenience for the user, eliminating concerns about wear and tear on physical connectors that can occur with traditional wired charging systems.

In contrast, other features listed would not accurately represent the benefits of wireless charging. For example, higher energy losses can occur in some wireless systems due to inefficiencies in energy transfer, and while maintenance requirements can vary, they are generally lower for wireless setups since there are fewer components that directly engage or wear out over time. Lower power output may also be associated with certain wireless charging systems compared to wired systems, but it does not define the unique advantage of having no physical connectors. Thus, the absence of connectors is a defining advantage that helps characterize this charging technology.