In this section, we explore the essential components of domestic electrical circuits. We begin with the sources of electrical power, typically supplied through overhead poles or underground cables. The primary wires involved are the live wire (often red) and neutral wire (often black), with a standard potential difference of 220V between them. At the meter-board, these wires go through a meter and fuse, connecting to various circuits in the home. Different appliances require specific circuits, rated for either 5A or 15A, depending on power usage. The earth wire, identifiable by its green insulation, ensures safety by directing excess current away from devices with metallic bodies, minimizing electric shock risks. Furthermore, we discuss the importance of fuses in preventing damage caused by overloading and short-circuiting. A short circuit occurs when live and neutral wires connect directly, leading to an increase in current. Fuses work by melting under these high currents, disrupting the circuit to protect appliances and wiring.