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

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Anode and Cathode:

The anode is the terminal of a device that electrons flow out of to complete a circuit. For example, the positive terminal of a thyristor is the anode.
The cathode is the terminal that electrons flow into to complete a circuit. For example, the negative or earth terminal of a thyristor is the cathode.

Be careful to avoid confusion here: We are saying that the anode is the terminal that electrons flow out of to complete a circuit, yet we think of the electricity as flowing in the positive and out the negative terminal.

The explanation is that we are thinking in terms of the conventional theory(+ to -), yet we are dealing with an electronic device, and we know that operates in accordance with the electron flow theory (- to +).


Company contact for McHale Plant Sales Ltd.



Accelerator pedal position sensor (APP), Ford FiestaAccelerator Pedal Position Sensor. The wiring diagram shown here is from a Ford Fiesta, 2002.

This sensor makes use of two potentiometers.


Apprenticeship is a method by which a person works for an employer in his or her chosen trade and learns the necessary skills, knowledge and attitudes to become a qualified craftsperson.

Apprenticeship in Ireland is now standards based, which means you will undergo specific tests and assessments to ensure you achieve certain pre-set standards of skill and competence at each of the seven phases, before moving on to the next phase.

See here for more information.


Arbitration means negotiation. For example:

In CAN bus systems, if two nodes try to access the bus at the same instant to send a message, unless we take precautions, there will be a conflict and possible data collision, with the resultant loss of data and network down-time.

In order to avoid this, the messages from each of the nodes have unique message IDs. The message with the lower ID is deemed to have the higher priority and gets sent first. Whilst this is happening, the other node goes into listening mode, and does not attempt to transmit its message. As soon as the higher priority message has been transmitted, the bus is free and the second mode can then automatically transmit its message. Conflict and data collision have been avoided, and the arbitration process only takes about 12 microseconds.


From Wikipedia:

Arduino, sold as Genuino, due to a trademark dispute, outside the U.S. and U.K., is a hardware and software company, project, and user community that designs and manufactures computer open-source hardware, open-source software, and microcontroller-based kits for building digital devices and interactive objects that can sense and control physical devices.

The project is based on microcontroller board designs, produced by several vendors, using various microcontrollers. These systems provide sets of digital and analogue input/output (I/O) pins that can interface to various expansion boards (termed shields) and other circuits. The boards feature serial communication interfaces, including Universal Serial Bus (USB) on some models, for loading programs from personal computers. For programming the microcontrollers, the Arduino project provides an integrated development environment (IDE) based on a programming language named Processing, which also supports the languages C and C++.

The first Arduino was introduced in 2005, aiming to provide a low cost, easy way for novices and professionals to create devices that interact with their environment using sensors and actuators. Common examples of such devices intended for beginner hobbyists include simple robots, thermostats, and motion detectors.

Arduino boards are available commercially in preassembled form, or as do-it-yourself kits. The hardware design specifications are openly available, allowing the Arduino boards to be produced by anyone. Adafruit Industries estimated in mid-2011 that over 300,000 official Arduinos had been commercially produced, and in 2013 that 700,000 official boards were in users' hands.

Read more....

Naming Conventions for the Arduino:

Take the example of "Arduino Uno R3":

This is the plain standard version of the board. This is a good board for those starting off with Arduino.

"Uno" is Italian for 'one', and refers to release version 1.0 of the Arduino software. Previous versions had names such as 'Serial', 'NG', 'Diecimila' and 'Duemilanove'.

"R3" relates to the revision of the features on the board, including updates, refinements and fixes. R3 is the third revision.

Introductory Video on Arduino

The rotating shaft of a starting motor. Inside a motor, this shaft is free to revolve. Mounted on it is a commutator which allows us to pass electrical current to windings which are wrapped around the shaft. In the middle of the armature is a laminated soft-iron core.

Typical armatures.


Arsenic is a deadly poison and is used in doping semi-conductors to produce N-type material.

That is why it is important to be careful when handling old electronic components. They may contain traces of this arsenic.


Asbestos warning signExtremely harmful material formerly used in brake and clutch lininig material, now banned form use. You may still come across it in friction and other heat resistant materials (heat shields, insulation), so treat it with extreme caution.

When particles of asbestos become airborne and are breathed in, they can embed themselves in the lungs. After a latent period of about 30 years, this can cause asbestosis, an inoperable disease which will result in death.


In the Baldoyle Training Centre, one of the two assistant managers, Aidan Owens, has responsibility for the CP Fitters' Section.

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Please note, if you want to contact the main Training Centre in Baldoyle, you need to ring 01-8167400.

If you want to contact the CP Fitters' Section, you can Contact Us by email,, or by telephone: 00 353 1 8167543 This number gets you through to the CP Fitters' Section, Baldoyle Satellite Unit.

Our Address is : Construction Plant Fitters' Section, Unit 116, Grange Way, Baldoyle Industrial Estate, Baldoyle, Dublin D13 CA48.
We operate in a satellite unit which is about 300 metres away from the main training centre. You can see the location of this unit here, in Google Maps. You can also Check here for directions to the Baldoyle Training Centre.

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Is Féidir Linn! You can view all the menus on this site as Gaeilge by going to the homepage, top right hand corner, and dropping down the language selection menu. By default it reads English (en), so just select Gaeilge (ge) instead.