This document provides an introduction to electricity and electric circuits. It defines electric current and how it is measured using ammeters or multimeters. It describes the basic components of electric circuits including wires, batteries, bulbs, switches and how they are represented symbolically in diagrams. It distinguishes between open circuits, closed circuits, and short circuits, explaining that current only flows in a complete closed loop. Fuses and circuit breakers are discussed as safety devices used to prevent too much current in a circuit.