Question: what is 2 amp charger?
Answer: Smartphones usually come with 1-amp chargers. Tablets and larger phones usually come with 2-amp chargers. (This is why tablet chargers are also known as 10-watt chargers, as Amps x Volts = Watts. So, effectively, 1-amp chargers are 5W chargers and 2-amp chargers are 10W chargers).