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Glossary of terms you will come across during your Phase 2 training.


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This is a software process that is performed in the ECM that optimises engine performance.
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Sometimes, course participants may feel they can add more to an explanation given in this glossary. In cases like this, they can add comments. See the comment at the bottom of this entry. (Please note: comments are only visible to registered users who are logged in.)
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This is content over and above what is on the Phase 2 syllabus for CP Fitters.
It is sometimes posted on the site in order to help apprentices who may wish to find out a little more about certain topics or equipment that is covered during Phase 2.
Additional content will not appear in any Phase 2 examinations.
You need only view additional content if you want to broaden or deepen your knowledge about specific topics or pieces of equipment.

Example of Additional Content

During the Electrical Module, there is a learning unit called 'Lighting Circuits'. During this unit, you will build various wiring circuits. One such circuit is an indicator (turn signal) circuit.
This type of circuit originally used what was known as a 'hot-wire' flasher unit. Nowadays, these older type flasher units have been replaced by electronic version.
If you would like to learn more about these more modern units, there is a page of additional information with an overview, links to data sheets and a video of the operation of a typical electronic flasher unit:
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Address bar in a browser windowThis is the part of a browser window into which you can type the URL (the web address) of a website. If you know the exact URL of a site, you should type it in here.
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In the context of AC electrical circuits, admittance quantifies how well the circuit allow (admit) the flow of current.

The opposite to admittance (allowing the flow of current) would be impedance (opposing the flow of current).

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From the Aerial Platform Hire website:

Aerial Platform Hire is Ireland's leading work platform rental company. Founded in 1980 we offer for hire self propelled boom and scissor lifts manufactured mainly by JLG industries, the worlds largest manufacturer of powered access equipment. We also offer Telescopic Handlers from JLG and Manitou Buggiscopics. Hire is available from strategically located depots in Clane, Co. Kildare and Mallow, Co. Cork. We deliver machines throughout Ireland from both of these depots.

Read more...

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Across Flats. A term used to describe measuring a bolt head. Note: This term does not describe the shank of the bolt, just the head, and hence what size spanner is required to open the bolt:
Across the flats
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A UK based engineering company established for over 45 years specialising in the manufacture of vocational automotive related training products.
They supply to motoring organisations, technical colleges, diagnostic equipment manufacturers, motor manufacturers, and Schools.

Visit their website

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Absorbed Glass Matte (AGM) Batteries

AGM Batteries are lead acid batteries. They use a separator consisting of fiberglass between the plates to hold the electrolyte in its place with capillary action.

In other words, the electrolyte is not in free-flowing liquid form, it is held in these absorbent mats. This is a safer arrangement, as it makes the battery "spill proof" - an important feature in the event of an accident or the vehicle over-turning. This type of battery also has a lower internal resistance. This increases the output voltage, and decreases charging time, AGM batteries are also often referred to as 'maintenance-free'. 

All battery charging over a certain voltage causes significant gassing. In flooded lead-acid batteries, these gasses are vented to the atmosphere. This results in a loss of electrolyte, which must be replenished during routine maintenance.

AGM batteries recombine these gases produced internally, back into the electrolyte, thus eliminating the need for topping up the electrolyte level during routine maintenance, hence the term 'maintenance-free'. 

These batteries are often VRLA, meaning that, should excess gas pressure build up during charging/discharging, these gasses are vented to the atmosphere.

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Air is a gas that is the main component of the earth's atmosphere. It is a mixture of many different gasses such as nitrogen (78%), oxygen (20%) and carbon dioxide (1%). There are much smaller traces of other gasses such as freon, neon, argon, helium, carbon monoxide and helium.

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