Wireless sensor network (WSN) is the network of small size, low cost, low weight sensors which are capable of sensing, transmitting, receiving and processing. The microcontroller inside the sensor node processes the sensed information and forwards it to the neighboring node. The information is den forwarded to the sink node through multiple hops. Nodes which are in the vicinity of the sink node will be receiving and forwarding the information from all other nodes. The power consumed in transmitting and receiving the data is much more than the power consumed by the microcontroller for processing the information. Because of this fact the nodes which are in the vicinity of the sink node deplete their energy faster as compared to the other nodes. In clustering the distance between the node and the sink node is reduced thereby reducing the power consumption. By properly selecting the cluster head, the power consumed in transmitting and receiving can be minimized.