Wireless sensor networks are obtaining a great relevancy in civil as military applications. These networks consist of a distributed set of sensor nodes which have very high restrictions for battery replacement and power consumption. Therefore, in order to give some recommendations to developers and optimize the energy spent of these devices, it is very signi cant to know how much power each component or basic operation consumes. In this paper we analyze the power consumption for wireless sensor networks. Our study focus in two basic operations: CPU state change and data transfer and receive. Our results show CPU state changing to low-power mode has a cost which must be taken into account to decide performing the transition. Also, we show an accurate measurement evaluation of the data transfer.
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