Samer is right. I feel like I need to write a blog post about this because it has been such a common question. Technically a power adapter rated at 2 amp means it’s capable of supplying 2 amp while still maintaining the rated voltage. But it’s not like the power adapter is constantly pumping out 2 amp — it just means that if your circuit draws 2 amp, it will still be able to guarantee the rated voltage. If the circuit draws more than 2 amp, the output voltage will start to drop and eventually collapse (which typically triggers a reset of the device). However, if your circuit only draws 1 amp, that’s totally fine, it’s not going to be destroyed or anything.