Design & Installation Science
Power factor correction – What is it? Why is it required? How is it achieved?
Power factor basics: Power quality is essential for efficient equipment operation, and power factor contributes to this. Power factor is the measure of how efficiently incoming power is used in an electrical installation. It is the ratio of active to apparent power, when: Active Power (P) = the power needed for useful work such as turning a lathe, providing light or pumping water, expressed in Watt or KiloWatt (kW) Reactive…
The basic principles of electromagnetism
This article will provide a basic introduction to the principles of electromagnetism and electric motors. As the name suggests, electromagnetism is a branch of physics that focuses on the interaction between electricity and magnetism. It plays a major role in most objects encountered in daily life. Electromagnetism is the interaction between conductors and fixed magnetic fields. This video provides an excellent overview of magnetic fields, flux density and motor effect.…
A review of electromagnetic induction
In this video, Gary Hayers of Tresham College takes a closer look at electromagnetism and the principles of generating AC. Student training aid to prove the basic principles of producing an alternating current (A.C) and developing and increasing an electromotive force (EMF) E = BLv. Videos are training aids for City and Guilds (C and G) and EAL courses Level 1, 2 and 3.
Ohms Law
Using Ohm’s law to find total resistance
In this video, Gary Hayers from Tresham College explains how to make basic ohm’s law calculations for series connected resistors.  Check out Gary’s video explaining how to make basic Ohm’s Law calculations. Videos are training aids for City and Guilds (C and G) and EAL courses Level 1, 2 and 3.
Generation and transmission of electricity
This article will briefly consider the different ways that electricity is generated and transmitted in the UK. Electricity is a convenient energy source because it is easily transmitted over distance via electricity cables, and has a wide variety of uses. However, electricity is not a primary energy source – it must be generated before it can be used, whether using coal, oil, natural gas or other fuels. Once it has…
Alternating Current & Direct Current
Mains electricity in the UK is an alternating current (AC) supply (230V). But what is AC and how does it differ to direct current (DC)? AC produces voltages with alternating polarity, moving forwards and backwards in a circuit over time, either through voltage switching polarity or a current changing direction and back and forth. It appears in a variety of electrical sources, most notably rotary electro-mechanical generators. An alternating current…