Question 50Electricity & Electronics - Assistant Engineer

The correct answer is B) capacitor. Capacitors can store a significant amount of electrical energy, even after the main power source has been disconnected. Before any work can safely begin on a capacitor, the stored electrical energy must be discharged to prevent the risk of electric shock or arc flash. This is a crucial safety requirement outlined in electrical safety standards and regulations. The other options are incorrect because potential transformers, resistor banks, and choke coils do not inherently store significant electrical energy that requires discharging before work can commence. While these devices may need to be properly isolated and de-energized, they do not pose the same immediate shock hazard as a charged capacitor.