Measuring voltage on an analog pin - What do I need to know about amperage?
Yes. The only thing you need to be concerned about is the voltage. It needs to be less than the Arduino Vcc.

The voltage sense circuit (analog inputs) typically have a high impedance and should draw a negligible current from the circuit being sensed. I didn't have much luck finding the actual spec for any of the AVR chips, but I did find this answer to the question on Electronics.StackExchange – where they say "hard to tell, the specs are incomplete, but 10 KΩ seems like a reasonable guesstimate/assumption" (I paraphrase). The reasoning is interesting and worth a read.