ABSTRACT
This chapter provides a solid framework for the development of an understanding of the behaviour of electronic components and electrical circuits. Electricity is all about the accumulation and movement of charged particles. Electrical current is measured in amperes or amps, and is an indication of how much electricity is flowing. An analogy is often used when explaining the basics of current electricity flowing in an electrical circuit in which there is a system of pipes and valves with water flowing through them. Resistance is measured in ohms and can be thought of as the opposition to the flow of electricity in a circuit. Resistance is a property of the components themselves and exists independent of the presence of any voltage or current. An electromagnetic field extends out from the current carriers and can have both wanted and unwanted effects in the general vicinity.
