**Cost Performance and Time**
Often us engineers get so bogged down in equations, using software, producing drawings and writing specifications that this becomes the sole focus. ...

**Control Theory**
Control theory looks at how systems work and are controlled from a mathematical view. This note gives a brief introduction to some of the concepts – more...

**Batteries**
A battery consists of one or more cells, each of which use stored chemical energy to produce electrical energy, There are many types of cells and these...

**Lightning Risk Assessment (IEC 62305)**
IEC 62305 'Protection against lightning' requires a risk assessment be carried out to determine the characteristics of any lightning protection system...

**MIT OpenCourseWare**
MIT OpenCourseWare, makes the materials used in teaching all MIT subjects available on the Web, free of charge, to any user in the world.

**Fault Calculations - Typical Equipment Parameters**
A frequent problem in fault calculations is the obtaining of equipment parameters. While it is always preferable to use the actual parameters of the equipment...

**Photovoltaic (PV) - Utility Power Grid Interface**
Photovoltaic (PV) systems are typically more efficient when connected in parallel with a main power gird. During periods when the PV system generates energy...

**Maxwell's Equations - Introduction**
Maxwell's Equations are a set of fundamental relationships, which govern how electric and magnetic fields interact. The equations explain how these fields...

**How Electrical Circuits Work**
If you have no idea how electrical circuits work, or what people mean then they talk about volts and amps, hopefully I can shed a bit light. I’m intending...

**Maxwell's Equations - Gauss's Electric Field Law**
Gauss's Electrical law defines the relation between charge ("Positive" & "Negative") and electric field. The law was initially formulated by Carl Friedrich...