Taking Huawei P40 with EMUI11 system and iPhone11 with IOS14.0.1 system as an example, the charging power can be seen on the charger of the mobile phone or the outer packaging box of the mobile phone.
The label of the mobile phone charger says the output voltage of the charger, usually 5V, and there is also a dual engine output voltage, generally 9V, and the charger with the output voltage of the dual engine will have a special identifier.
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The charger will also mark the charging current, such as 2A or 1.5A, some flash charger marked with 4A charging current, the power of the charger is the charging current x output voltage, the unit of power is watts (W).
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Generally speaking, the higher the power, the faster the charging rate, but there are certain limitations. For example, this mobile phone supports 5V\/1A charging power, the use of 5V\/2A charger can charge this mobile phone, but its charging rate is the same as the original charger, because the charging power of this mobile phone is limited to 5V\/1A, and the use of a high-power charger is still this charging rate.
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In other words, the mobile phone supports 5V\/2A charging power, we use 5V\/1A charger to charge this mobile phone, then the charging time will be greatly increased, because the charging current is small, can not meet the demand for charging in time.
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The charging head with large output current has abundant charging power, high selection of internal component parameters, large redundancy of rich power, and is not easy to be damaged, but there is a problem of expensive price.