In this study, the instabilities of electrospinning were observed and evaluated by measuring the drop area, the current, and the electrical force using PVAc and PVA. Those values were measured simultaneously during electrospinning and the instabilities were analyzed as a function of time. The electrospinning was carried out by changing the voltages and the feed rates. The results suggest that different electrospinning conditions such as voltage, polymer, and flow rate caused different behaviors of instabilities, current and electric force, however, all the used methods were effective for studying the instabilities in electrospinning.