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Wireless Sensor Network (WSN) is a major catalyst in the advancement of the computer networks. WSN is used in outdoor applications like environmental monitoring and military surveillance. These open environments cause WSN to be more vulnerable to various wireless hackinglike spoofing jamming and broadcast attack. Securing a WSN from these attacks is a challenging task. Denial of Service (DoS) attack is one of the major security attacks in WSN. Jamming a single or cluster of nodes is a type of DoS attack on WSN. In this paper, a novel approach in detecting the physical layer DoS style jamming attack is proposed and analyzed. Here, we propose a method called physical layer jamming identification. This method is based on residual energy where few nodes are marked as monitor nodes. These nodes monitor the jamming attack by checking the Receiver Signal Strength Indicator and packet delivery ratio values of other nodes. It improves system performance and increases packet deliver ratio.