how to know the power that a working Arduino require

Hi everyone,

I am new to Arduino. Now I have a task to play with Arduino. I have already hooked up all my meters, sensors, Wifi shield and my Arduino Uno. I want to know the power that the Arduino consumes when the whole system is working. And I want to read the this out if possible since I have Wifi. Is that possible? How can I implement it? Do I need more electrics or just more programming script?

Thank you so much for your help!

Multimeter on amps range connected in series with the power supply?

MarkT:
Multimeter on amps range connected in series with the power supply?

Thank you for your reply.
Yeah I can do this, but I can not do this all the time. This project is like a outdoor project, I can not holding multimeter all the time. Also, I can not read data from Arduino itself.
Since I have Wifi, I want to read it from web. I can do interface things.

raschemmel:
SparkFun Current Sensor Breakout - ACS723 (Low Current) - SEN-14544 - SparkFun Electronics

SparkFun Current Sensor Breakout - INA169 - SEN-12040 - SparkFun Electronics

Thank you so much!