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


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Picture of Site Administrator

Site Administrator

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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.

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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.

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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.

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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.

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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.

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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.

As can be seen from the image below, when asbestos is viewed under a microscope, we can see that the individual particles are spear like, with sharp ends. When these 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.

Asbestos fibres as viewed under a microscope

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

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An astable square waveAn astable circuit is an electrical circuit that does not stay in one stable condition. If you were to monitor it with an oscilloscope, it produces a 'square wave', this is a digital waveform with sharp transitions between low (0V) and high (+Vs). Note that the durations of the low and high states may be different. The circuit is called an astable because it is not stable in any state: the output is continually changing between 'low' and 'high'.
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During the induction phase of the course, you will be issued certain tools, Tools Issued on Repayment.

As of July 2012, the cost of these tools to you is €200. This sum varies from time to time, as the prices of the tools fluctuate.

The cost of these tools is deducted from your wages over the durantion of the course, working out at €10 to €15 per week.

If you already have some or all of these tools, no issue and no deductions will be made.

You can see the full lust of tools here

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This is short for 1 atmosphere, or 101.3 kN/m2 (expressed in SI units), or 14.7 psi (expressed in Imperial Units).

One atm is atmospheric pressure, 2 atm is twice atmospheric pressure.

Don't confuse this term with bar. They both measure pressure, but they are not the same.

1 bar = 100 kN/m2 = 14.5 psi

1 atm = 101.3 kN/m2 = 14.7 psi


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