The fundamental form including the electron magnetic trapping effects is presented for the efficiency of current drive in toroidal geometry with waves at frequencies below the electron cyclotron frequency and we examine the characteristics of LD and AW damping mechanisms. We also examine in some detail the absorption of RF wave energy by electrons when $\omega=\omega_{ci}$. Using these results and KT-2 conceptual design parameters, we obtain current density under the assumption of small tokamak. By varying tokamak parameters, we investigate the characteristics of FWCD and the values of $\gamma_{CD}$.
