This document discusses electrical safety in laboratories. It begins by explaining basic concepts of electricity like voltage, current, resistance and power. It then discusses effects of electric current on the human body and hazards like electric shock. The document outlines various electrical equipment found in labs and safety measures around their use, maintenance and repair. It also discusses electrical accessories like extension cords, power strips and safety devices. Emergency procedures in case of electrical accidents are provided. The key emphasis is on understanding electrical hazards and ensuring proper training before using any electrical equipment or accessories in laboratories.