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USB wall sockets output: • Low-voltage direct current (DC) • Voltage is internally converted and regulated • Can be directly supplied to electronic devices. Therefore, the USB wall socket itself performs the power conversion task originally done by the adapter.

Under normal circumstances: The USB interface itself does not pose a risk of electric shock. The real concern is not the USB output end, but rather: Whether the high-voltage to low-voltage conversion process inside the wall socket is safe and reliable.

Not all refrigerators "must" use 16A wall sockets. The reasons are as follows: • The rated operating current of a refrigerator is far lower than the load capacity of a 10A or 13A socket. • Under normal circumstances, its operating current does not constitute an overload for a regular socket.

A satellite TV wall socket is a low-voltage connection port used for transmitting television signals, satellite signals, and radio frequency signals. Unlike 220V or 110V high-voltage sockets, satellite TV wall sockets only transmit signals, not power.

USB wall socket is a power device that integrates a traditional AC power socket with a USB DC output interface on the same panel. • Directly output 5V or other standard USB DC voltages • Built-in power conversion module (AC to DC) • Powers USB devices without an external charger • Typically installed on the wall in combination with a regular socket

The answer is closely related to the different levels of emphasis placed on "grounding" safety in the two countries, differences in electrical system voltage, and plug specifications. UK wall sockets must have a complete three-prong structure because: the UK uses a 230V voltage system, which is higher.