The application of electroactive polymers into soft transducers such as actuators, sensors or artificial muscles has become popular lately owing to the recent development of various numerical frameworks, which make it possible to analyze and simulate multi-physics problems with the help of computational methods. The energy formulation sets out to derive the free energy that contains information on the behavior of dielectric elastomer transducers under various electric fields or mechanical loadings, so that the energy-based formulation may meet the requirement of the principles of continuum mechanics and the laws of thermodynamics. The goal of the present study is, by applying the principle of virtual work to electromechanical problems, to set up a computational framework for which the linearization is carried out to be readily implemented into the finite element method to simulate the behavior of soft transducers under external stimuli.