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


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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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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 +).

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Main areas of a spark plug namedThe anti-flashover insulation is there to prevent the HT electricity from running down the outside of the spark plug and reaching earth where the plug is screwed into the cylinder head or barrel. Because this path is in the atmosphere, it presents an easy path to ground for the HT electricity, so we use ceramic to insulate the centre electrode and we put a series of ribs into the ceramic to further reduce the conductivity of this pathway.
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