The voltage supplied by a typical phone charger is often 5 volts DC (Direct Current). This level is a standard established for USB power delivery, ensuring compatibility across various devices. Wall adapters transform the higher AC voltage from wall outlets to this lower, safer DC voltage suitable for charging sensitive electronic components within a mobile phone. For example, plugging a USB cable from the adapter into the phone initiates a charging process regulated by internal circuitry.
Adherence to a standardized voltage offers significant advantages. It ensures a degree of safety for both the user and the device being charged, preventing potential damage from overvoltage. Historically, varied and unregulated voltages caused compatibility issues and increased the risk of device failure. A common voltage standard simplifies manufacturing, reduces electronic waste through charger interchangeability, and promotes user convenience.
