**Power Factor**
Power factor is the ratio between the real power (P in kW) and apparent power (S in kVA) drawn by an electrical load. The reactive power (Q in kVAr)...

**Variable Frequency Drive**
Variable frequency drives are widely used to control the speed of ac motors. This note looks at the mechanisms which enable drive units to control the...

**International System of Units (SI System)**
The International System of Units (abbreviated SI) is the world's most widely used system of units. The system consists of a set of units and prefixes...

**What is Aircraft Ground Power**
Ever wondered what kind of power an aircraft uses when parked at the airport stand. Normally the aircraft generates it own power, but when parked with...

**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...

**Post Editing Tips**
If you at all familiar with programs like office and outlook, then adding and editing posts is pretty straightforward and intuitive. However, there are...

**Why use catalogues**
I'm a fan of using manufacturers catalogues. There are two main reasons for this. Firstly, if your involved in the purchase of equipment, you will likely...

**8 Steps to Low Voltage Power Cable Selection and Sizing**
A recurring theme on our forums is cable sizing. Now many installations are unique and require special consideration. However, a lot of the time things...

**Inductance**
When current flows within a wire, a magnetic field is created. The potion of this magnetic field perpendicular to the wire is called the magnetic flux...

**Laplace Transform**
Laplace transforms and their inverse are a mathematical technique which allows us to solve differential equations, by primarily using algebraic methods...