Is this: The Charger plug in the power input is 220v because the charger is a transformer through the coil turns the 220v buck and then a series of steady flow and so on mobile phone charging according to the need for charging voltage is generally 3.7~4.2v so the output voltage is 3.7~4.2v Electricity is based on the power of electrical appliances like to charge the phone general output current in 500~800ma if the charger above the input 220v output 4v 650MA Of course 650ma is the maximum output power of the charger and is stable.
For example, 5.4V 500mA
5.4V means that the output voltage is 5.4V, because the power supply is 220V is certain, the proportional coil of the charger is certain, so the output voltage 5.4V is certain. 500mA represents the maximum current that can be output, i.e. the rated current is 500mA, But it does not mean that the current is so large when charging the phone or something else, the current is determined by the container to be charged but the maximum is 500mA. Like the motor, the voltage is certain, but the power is the voltage * current is determined by the motor driven follower, but the maximum does not exceed the rated power.
What does the charger's output current and voltage mean?
