The monitoring of energy consumption is a very useful practice in order to understand the functioning of the electricity, very important component in the life of every thinking human being. This understanding helps people to manage the electrical appliances in their home, office, in general allows for positive action in a reduction of such consumption. See real-time numbers “kilowatt” when you turn on a device makes it clear how much this adds to the cost of the energy bill, then see the other number “kilowatt hour” which is the consumption over time suggests the total amount of energy that we used in a day. A monitoring system transforms these numbers, sometimes complex, in graphic data simple and intuitive.