Microfluidic emulsion generation method using electric fields as a driving force is presented here. The electrical stress generates the motion of the two phase interface inside a microchannel that confines the maximum sizes of generated emulsions. The threshold condition for the first emulsion detachment is analyzed using the balance of electrical stress and interfacial tension, which is described as an electrical weber number, We. As the two liquids have different electrical conductivities, the current flowing through the microchannel changes according to the location of the two phase interface. The real-time changes of current levels and frequency in response to the emulsion generation allow to theoretically analyze the sizes of the emulsion and the period of single emulsion generation, respectively. Thus, the characteristics of emulsions, such as generation frequency, size, and quantities can be obtained without visualizing inside the microchannel through the bulky setup like optical microscopes. Furthermore, , the generated emulsions in the electric-field driven method remain inside microfluidic reservoirs, as distinguished from the other methods based on the continuous flow of liquid phases. This unique characteristic minimizes the required liquid volume to generate emulsions down to ~5 L.