The 15w1a and 5w2a are both models of chargers, of which the 15w1a charging power is higher than the 5w2a, so the 15w1a charging speed is faster. Specifically, the 15w1a has a maximum output of 15 watts and can charge devices quickly, while the 5w2a has a maximum output of only 5 watts, which is relatively slow. Therefore, if you need fast charging, it is recommended to choose 15w1a. However, it is important to note that not all devices can support the charging power of 15w1a, so you need to confirm the charging needs and compatibility of the device before buying.
According to the relationship between current and voltage, the higher the power, the faster the charging speed. The 15w1a has 15 watts of power and 1 amp, while the 5w2a has 5 watts of power and 2 amp. As a result, the 15w1a charges faster because it has higher power.