The unit presents a fundamental introduction to electrical circuits and is the first unit to cover this material for all engineers. It covers basic concepts used in the study of electricity and circuits, including the fundamental laws of electrical phenomena, and methods for the analysis of circuits based on the underlying physics and mathematical models. The circuit theorems are studied and applied to solve circuits containing resistors, capacitors and inductors. The unit covers transient and DC/AC circuits, including AC power analysis, three-phase circuits, frequency response and phasors. This unit is considered to be essential for all engineering students and forms the basis for many second, third and fourth year units. The unit assesses students through formal examination and the completion of a report on the practical work performed during the semester. After completing the unit, the student will be able to analyse a circuit containing single phase or three phase AC sources, as well as where transient and DC sources are present. The unit provides the student with the opportunity to become familiar with the safe operation and efficient use of electrical/electronic testing equipment.