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


Browse the glossary using this index

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Z

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A Zener diode behaves like an ordinary diode up to a certain point. In other words, it acts as a one way electrical valve that allows electricity to flow in one direction only. It does this up to a certain point. However, when voltage acting against the normal flow rises to a certain point, the Zener collapses and conducts freely in both directions. It will continue to do that until the voltage acting against the Zener drops below a given value. Once this happens, the Zener again behaves like an ordinary diode.

Zener diode symbol.

Because of this quality, the Zener is especially useful in voltage regulation circuits.

:
Non-ferrous metal with excellent resistance to corrosion. Often used to cover and protect mild steel-for example in corrugated roof sheets.
Zinc was one of the two metals used by Alessandro Volta in his voltaic pile. The other metal he used was copper. These two dissimilar metals were arranged in a pile, and separated by leather discs soaked in sulphuric acid to produce what was essentially the first battery.

Δ

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This letter is from the Greek alphabet, and is the capital letter Delta, Δ.

In plant vehicle engineering, we will come across it in two contexts:

  1. Delta wound statorIn Electricity, the stator of an alternator can be wound in one of two ways, star wound or delta wound.
    The image on the right is of a 'delta' wound stator. It is said to be delta wound because of the triangular shape of the wiring diagram.
  2. In general engineering and calculations, when delta is placed in front of any value, it represents a change in that value.
    For example, in the definition of power, we talk about a metric horsepower being when a mass of 1 kg is raised by a height of 1 metre in 1 second.
    The 1 second is represented by Δt (change in time), and the 1 metre is represented by Δh (change in height).

Μ

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Letter from the Greek alphabet used on the CP course to represent the coefficient of friction when carrying out calculations in the Transmissions Module of the course.

The co-efficient of friction between two surfaces is simply the relationship or ratio between those two forces. If I want to move a body along a surface at a constant speed, it will require a certain force. The magnitude (size) of that force depends upon the nature of the two surfaces in contact and the downward force pushing the two surfaces together.

The Greek Alphabet

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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, admin@cpfitters.info, 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.
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