Explain why the gel electrophoresis instrument must have a power supply?

The gel electrophoresis instrument requires a power supply to generate an electric field across the gel matrix, which facilitates the movement of charged molecules, such as DNA, RNA, or proteins. When the power supply is turned on, negatively charged molecules migrate towards the positive electrode, allowing for separation based on size and charge. This process is crucial for visualizing and analyzing the samples effectively. Without a power supply, the electrophoresis process would not occur, preventing the separation of the molecules.