The current of the power adapter

1. Is the power adapter good for high current? The unit of battery capacity is mAh (milliampere hour), and the unit of current is A (ampere) or mA (milliampere hour). The two are not the same physical quantities, and battery capacity is not necessarily related to charging current.

2. Is the power adapter good for high current? The current value marked on the mobile phone charger (actually called a power adapter) is the maximum output current, not the charging current, and cannot be confused. The charging current of the battery is controlled by the charging circuit inside the phone and is not determined by the adapter. Therefore, the higher the rated maximum output current, the greater the power of this adapter, which can replace other low-power adapters with the same voltage. There is no problem with this, and there is no saying that "high current adapters shorten battery life". Moreover, there is a regulation in electricity that for power supplies with the same voltage, high current ones can replace low current ones, but not vice versa, because if you charge with a particularly small adapter, the adapter may be in an overload state, which can burn out the adapter.

What does the output current of a power adapter mean? The output voltage of the power adapter needs to be equal to the input voltage of the electrical device (or the electrical device must specify that the input voltage is within a range and the adapter output voltage is within that range)

The output current of the power adapter is the maximum current that the adapter can output, and the actual output current is determined by the electrical equipment. Simply put, it depends on the impedance of the electrical device (external resistance) and the impedance inside the power adapter (internal resistance) I=U/(R internal+R external).

The (maximum) output current of a power adapter actually characterizes its internal resistance (the larger the output current, the smaller the internal resistance, which means the adapter itself consumes less power and can be used for external power).

So, whether it can be exchanged depends on the nominal input current of the electrical equipment. If the nominal input current of the electrical device is less than the output current of the power adapter, it can be used. Otherwise, it cannot be carried, but it will not damage the equipment.