The difference between 3a and 5a:

1 and 3A charge slowly but the conversion efficiency is higher than 5A. The greater the current, the faster the charging. The rated current of the charger is not the actual current at work, and it will be automatically adjusted according to the load size, but the maximum current does not exceed the rated current.

2. The strength is different. 5A supports 240W electrical appliances at most, and 3A supports 96w electrical appliances at most. The charging cable must match the power of the mobile phone before it can be used, otherwise it will easily damage the battery of the mobile phone.

3, 5A, 3A charging line costs are also very different. Under the premise of the same brand, the charging cables of 5A and 3A are twice as expensive as 3A.

Extended data:

The charger of 5A can charge the charger of 3A. As long as the charging voltage is 5V, the chargers can be mixed, and the current only determines the charging time. However, the charging current of general mobile phones is limited, so it doesn't matter to use the charger for freshmen, but it is not suitable for long-term use.

At present, most mobile phones and mobile power supplies have a large amount of electricity, which can bear a large current when charging, which can effectively shorten the charging time. Moreover, the output current of the charger is relatively large, which can reach 5A.

References:

Baidu encyclopedia-charging line