basic 3 min read
Chemical effects of electricity
A material must contain charged particles to be able to conduct electric current. In solids, the current is carried by…
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basic 1 min read
Temperature coefficient of resistance
In general, as the temperature of a material increases, most conductors increase in resistance, insulators decrease in resistance, whilst the…
basic 3 min read
Potential difference and resistance
For a continuous current to flow between two points in a circuit a potential difference (p.d.) or voltage, V, is…
basic 2 min read
An introduction to electric circuits
Standard symbols for electrical components Symbols are used for components in electrical circuit diagrams and some of the more common…
basic 1 min read
Electrical potential and e.m.f.
The unit of electric potential is the volt (V) where one volt is one joule per coulomb. One volt is…
basic 2 min read
Units associated with basic electrical quantities
SI units The system of units used in engineering and science is the Systeme Inter- ` nationale d’Unites (International system…
basic 1 min read
Multiplexers
Overview A multiplexer is a device that brings the concept of a rotary switch in analog electronics to the digital…
basic 3 min read
Multiple-bit adders
Ripple carry adder It is possible to create a logical circuit using multiple full adders to add N -bit numbers.…