3 D
Set the task for individual work and pairwork checking. Feed back verbally.
Answers 1. Speakers change electrical signals into sound.
2. The quality of a photo can be improved by using a better lens.
3. By using headphones you can listen to music without disturbing anybody.
4. File sizes can be made smaller by using compression. 5. A sensor can transform light into electrical signals.
6. Electrical signals are transformed into different coloured light on a screen.
7. More detailed pictures have a higher resolution.
E Set for pairwork. Students should look at the different groups of words and recognize that each group has a similar prefix. They are likely to recognize some of the more common words as measurements, e.g., millimetre (1/1,000th
of a metre) or millisecond (1/1,000th Feed back visually.
Answers All of the prefixes relate to some type of measurement.
A bit is the smallest unit of computer storage; a kilobit is 1,024 bits; a megabit is 1,000 kilobits; a gigabit is 1,000 megabits; a terabit is 1,000 gigabits. Data transfer is often measured in bits per second, rather than bytes per second.
There are 8 bits in a byte. A kilobyte is 1,024 bytes; a megabyte is 1,000 kilobytes, a gigabyte is 1,000 megabytes and a terabyte is 1,000 gigabytes. Computer storage is usually measured in bytes.
A metre is a standard measurement of distance. There are a thousand millimetres in a metre. There are a thousand micrometres (also known as microns) in a millimetre (10−6
Encourage them to guess the meaning of the other prefixes and to put the groups in order of size.
3.1 Vocabulary
F Set the task for individual work and pairwork checking.
Explain that this is further practice in using words with prefixes.
Remind students that the form of the word must fit into the sentence. 3.1_F
Feed back, checking pronunciation and stress patterns for each sentence. You could use the recording to model the pronunciation – though if you do, bear in mind that there is generally more than one possible way of stressing sentences like these.
Answers
1. The speed of light is approximately 300,000 metres per millisecond.
2. The clock speed of the central processing unit is measured in gigahertz.
of a second).
3. The engineers increased the data transfer speed to 70 megabits per second.
4. The storage capacity of disk drives is now measured in terabytes rather than gigabytes/megabytes.
5. The physical size of a computer component is usually measured in millimetres.
Closure
Check the meanings of words learnt in this lesson using the photographs on Course Book page 29. Ideally, present the photographs visually to the class, and work through the vocabulary again.
VOCABULARY BANK 3.1 Identifying stress within words
Refer students to Vocabulary Bank 3.1, and tell them to review the examples and work through some or all of the stress patterns.
metres). There are 1,000 nanometres in
a micrometre. Micrometres/Microns and nanometres are often used to give the dimensions of components on silicon chips. A kilometre is 1,000 metres.
Hertz is a standard measurement of frequency. A kilohertz is 1,000 cycles per second. A megahertz is 1,000 kilohertz. A gigahertz is 1,000 megahertz. Hertz is commonly used to measure computer processing speed and frequency in signals.
LANGUAGE NOTE Stress patterns
The patterns shown in Vocabulary Bank 3.1 are productive, i.e., they enable you to make more words or apply the rules accurately to other words. The words with unusual patterns tend to be the more common ones, so if students come across a new multisyllable word at this level, it is likely to conform to the patterns shown. Native speakers recognize the patterns and will naturally apply them to unusual words, e.g., proper nouns.
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