PV modules are susceptible to shading, which can significantly impact their electrical performance. While previous research has focused on the effects of shading on module-level performance, the electrical characteristics of individual cells operating within a shaded module remain understudied. Partial shading can cause bumps on the current-voltage (I-V) curve and shift the operational point of the module, affecting the electrical behaviour of individual cells. Under uniform irradiance, all cells with identical characteristics will behave similarly, but under partial shading, these cells respond differently. A custom-built setup was used to measure the voltage and current of a full-cell crystalline silicon module and its individual cells while shading a single cell. The results show that shading a cell reduces its operational voltage and affects the voltages of the unshaded cells, which depends on the module’s operational current-voltage point, which is determined by the Maximum Power Point Tracking (MPPT) algorithm used. The results further show that efforts to extract maximum power from a partially shaded module result in the shaded cell operating at higher temperatures, which can lead to hot spot formation and module degradation.