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


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Electrical device used to generate electicity in plant vehicles. The device gets energy via a drive belt from the engine, and converts this mechanical energy into electrical energy to be used by the vehicle electrical systems. Once the engine is running, the alternator supplies all electrical loads in a plant vehicle.

The three things necessary to generate electicity.

Alternator, with part of the stator cut away and folded out to facilitate viewing the rotor.

As the name implies, the unit produces alternating current, which cannot be used by plant vehicles. This output must be rectified to direct current by using diodes.

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Non-ferrous metal, relatively soft, but much lighter than steel.
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Ambient simply means surrounding. For example, ambient temperature is the surrounding temperature.
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An ammeter is an electrical instrument for measuring electrical current.

Ammeters have very low resistance, and so must always be connected in series in a circuit:

Inserting an ammeter into a circuit.

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Ampere (often abbreviated to amps) is a measure of the rate at which a given amount of electricity flows in a circuit. This term is commonly shortened to amps.

When one coulomb of electricity has passed a given point in a circuit in one second, one ampere of electricity is said to have passed.

This figure gives us no indication of what force is pushing the electrons (voltage), but it does tell us how much and at what rate the electricity is being pushed.

1 ampere is 1 coulomb per second.

Visit here for more information on Andre-Marie Ampere, the man the unit of measurement is named after.

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The ampere hour capacity of a battery is the amount of current the battery can deliver for a given period of time.

It is usually based on a period of 10 hours.

So, a battery with a rated capacity of 60 ampere hours at the 10 hour rate should be able to supply a steady current of 6 amps for 10 hours. 

Typical battery lable.

This battery is rated at 110 Ahr. It should be able to supply a steady current of 11 amps for 10 hours.

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Waveforms with captionsAmplitude, or peak voltage, is the maximum signal voltage relative to zero.

The apmlitude or peak voltage of the waveform here is approximately 0.7V.

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AND gate, OR gate, NOT gate (inverter)

In the phase 2 syllabus, we will study electronics and logic.

During the course of these studies, we will look at the following logic gates:

  • AND gate
  • OR gate
  • NOT gate (inverter)

You can read more about the logic gates on the phase 2 syllabus here

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In the context of electronic engine management, anemometer describes a sensor that is used for measuring air quantity.
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During phase 2, you will come across the need to soften copper washers, before using them as seals between injectors and cylinder heads. Copper tends to harden, even when not in use. If we use copper in this condition, it will not form a good seal.

To avoid this we anneal the washer. We heat it to a cherry red, then quench it in water. This has the effect of softening the metal, making it suitable for use as a sealing washer.

Strictly speaking, it is not necessary to quench in water. Allowing the washer to cool itself would suffice. We quench them to save time.

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