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



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On occassion, a computer may start to behave in a strange manner, become slow in operation, may lock up or it may even become hung. To solve these problems, a reboot is required. This shuts down and restarts the computer immediately.

Reboots may also be required after updating anti-virus software, or updating your operating system.

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Random Access Memory: This is fast memory used by computers to keep track of all open documents and programmes on a computer.

For example, as of February 2009, 1024Mb of RAM is now considered to be the absolute minimum required to run a modern OS on a computer. Perhaps 2048Mb may be a more realistic figure.

RAM is volatile memory. If you remove the power source, RAM looses any data written to it. When you open a new doucment or spreadsheet, until you save it, it only exists in the RAM. If there were a power cut, you would loose all your data and work. That is why it is important to immediately save anyting you are working on, and to continue to save it at regular intervals as you work.

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James Watt

The Watt is the measurement of power, and gets its name from James Watt. This is the modern metric way of measuring power.

The old way of doing it was to measure the power of something relative to the power of a horse: horsepower.

If a force of 1 Newton moves an object through a distance of 1 metre in 1 second, then 1 Watt of power is said to have been expended.

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Standards Based Apprenticeship. Apprenticeship in Ireland is now standards based, as opposed to the old system of time served. This means that the apprentice must reach a pre-determined standard at each of the phases, before they can progress to the next phase.
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Standards Based Apprenticeship: often abbreviated to sba. Apprenticeship in Ireland is now standards based, as opposed to the old system of time served. This means that the apprentice must reach a pre-determined standard at each of the phases, before they can progress to the next phase.
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Prefix for units of measurement: for example kilometre - a thousand metres; kilogramme - a thousand grammes.

Check here for more on prefixes and units of measurement.

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Used in connection with combustion and air/fuel ratios. The stoichiometric, or chemically correct ratio is the mass of air in Kg required to completely burn one Kg of fuel.

For petrol, this ratio is approximately 14.7:1 and for diesel, it is approximately 14.5:1.

The Greek letter λ is used to represent this ratio.

When λ = 1, this is the stoichiometric or chemically correct ratio of air to fuel. In other words there is sufficient air present to fully burn a given quantity of fuel.

When λ < 1, the amount of air present is less than what is required to burn a given quantity of fuel. In other words, the mixture is too rich.

When λ > 1, the amount of air present is more than what is required to burn a given quantity of fuel. In other words, the mixture is too lean.

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kV means kilovolt.

1 kV = 1,000 volts.

For example: Modern ignition systems can generate sparks of up to 40 kV.
In other words, modern ignition systems can generate sparks of up to 40,000 volts.

Check here for more on S.I. units of measurement and prefixes.

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In terms of electronic control of vehicle systems, redundancy refers to the use of a back-up sensor in the event that the first one should fail.

For example, the accelerator pedal travel sensor is a critical one and is fitted in redundant configuration. In other words, it transmits 2 signal voltages to the ECU. One signal voltage is exactly half the value of the other. That way, should one fail, the other will be there to maintain a signal to the ECU.

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Kilogramme (abbreviation Kg) is 1,000 grammes.

Kg are the basic S.I. unit for measuring mass.

Check here for more on basic S.I. units.

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