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You learn the basics of electrical theory from first principles to the stage where you can solve complex circuits. You cover AC theory and the issues arising from this common type of electric power. Digital and analogue circuits will also be covered and the issues arising from each type of control. You begin with the basics of electricity and simple circuits, such as current, voltage and Kirchhoff’s Laws and describes different methods to solve more complex circuits. The sinusoidal AC circuit is introduced and the control of its waveform, including the use of phasors. The harmonics of output are considered and the use of filters to control the outputs is introduced. We provide the tools and knowledge to analyse and solve complex electrical circuits. Electronics is introduced with simple descriptions of fundamental electronic devices, such as diodes and transistors. It covers analogue circuits, especially the amplifier and goes on to use logic gates to create simple logical functions.