Abstarct: With using string theory and AdS/CFT correspondence, the extremal RN AdS black holes bring more attention in the strongly coupled condensed matter systems. In these studies the field theory is at zero temperature. In this thesis, we study energy loss of a moving heavy point particle. Although the temperature is zero, but the entropy is finite and we express the final results in terms of entropy and chemical potential. The relaxation time, friction coefficient and drag force are calculated, carefully. We also consider the gravitational corrections which are correspond to finite coupling corrections and find effect of them in the above parameters.