Adders and Multipliers are used frequently in the design of several computing subsystems that includes arithmetic and logical units (ALUs). A quantum-dot cellular automata (QCA) which is promising and emerging Nano-technology is used to realize such subsystems with high-performance, ultra-dense and low-power. For reliable realizations of QCA based designs, structural and power analysis is essential. Most of the QCA based Ripple Carry Adder (RCA) reported in the literature doesn't consider the structural and power consumption issues. In this paper, the existing design of QCA based Ripple carry adder is studied extensively based on structural and power analysis. The QCA based RCA is implemented and verified for its functional output using QCA Designer tool. The power dissipation is estimated using QCA Pro simulator which is an accurate power estimator tool. © 2006-2018 Asian Research Publishing Network (ARPN).