We developed the method for measuring the contact angle and interfacial tension electrically in a two phase liquid electrowetting system. By measuring the capacitance and translating it, we obtain contact angle values. We showed the contact angles measured by capacitive method are identical to those by image analysis. The rate of the change of the contact angle according to the applied voltage also reveals the information for the surface tension. We extracted the surface tension values by differentiating the contact angles with respect to the applied voltages. The surface tensions extracted from the differentiation are shown to be in agreement with the values from surface tension meter. When the electrowetting is carried out, checking the electrical breakdown is necessary to make sure that the voltage is being applied without current leakage. We achieved the real-time monitoring of the electrical breakdown by measuring the phase angle shift.