Terahertz (THz) radiation is capable of supporting high bandwidth and is non-damaging yet sufficiently penetrating. Therefore it has a plethora of applications spanning from medical screening to communications. However, due to the current limitations in current THz generators and detectors, the THz EM spectrum is relatively unexplored, and there is a need to enhance components like THz polarizers. We report the construction and characterisation of a THz polarizer device based on liquid crystal (LCs). The device consisted of a thin layer of LC mixture E7 sandwiched between two glass plates coated with Indium Tin Oxide (ITO). An electrical potential difference was applied across the plates. The LC molecules had an electrophilic and a nucleophilic end, so we hypothesised that the LC molecules would have greater alignment with increasing voltage, causing the optical properties of the device to change in real time. We characterized the device in a Polarized Terahertz Time Domain Spectroscopy set up, using a wire grid polarizer was used for calibration. We demonstrated that the voltage applied across the LC could be used to manipulate THz waves by changing the amplitude and polarisation of the THz waves, even at low voltages and only 0.1ml of LC used. Our result offers a significant new way to manipulate THz waves without the need for mechanical parts. For future work, other LCs may be studied, due to the similar general properties found in most LCs.