unit-05.pdf
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Automotive Industries
© Pearson Longman 2008 www.pearsonlongman.com/technicalenglish
J7260PEARSON Technical English
Automotive Industriesaw_05_01
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Flow
FlowCable
1 Readthetextandlabelthediagramwiththewordsinbold.
Unit 5
The electrical system of a carThe battery stores electricity. When you turn the ignition key, electricity fl ows from the battery to the starter motor. This turns the engine. The engine drives the alternator. This acts as a generator and produces electricity. It also charges the battery. The alternator produces alternating current (AC). A rectifi er pack changes AC to DC (direct current). Diodes in the rectifi er pack make sure that output from the alternator fl ows in one direction to the battery. But current can’t fl ow from the battery to the alternator. Electrical current runs through the cables of the car’s electrical circuit. The current leaves the battery through the positive terminal. It returns to the battery through the negative terminal.
2 Whichwordsinthetextdothesewordsreferto?
1 This(line2) a)startermotor b)ignitionkey c)battery
2 This(line2) a)engine b)generator c)alternator
3 It(line2) a)generator b)electricity c)alternator
4 It(line6) a)battery b)current c)terminal
3 Readthetext.Matchthepartswiththeirfunctions.
1 Thebattery
2 Thecables
3 Theengine
4 Thealternator
5 Thediodes
6 Therectifierpack
a)carryelectricitytodifferentpartsofthecar.
b)generateselectricityforthecarandchargesthebattery.
c) changesACtoDC.
d)drivesthewheelsofthecarandthealternator.
e) storeselectricityforthecar.
f) allowelectricalcurrenttoflowinonedirectiononly.
Automotive Industries
© Pearson Longman 2008 www.pearsonlongman.com/technicalenglish
4 Completethesentenceswithwordsfromthebox.
around/from/into/outof/through/to
1 Electricityflows theelectricalcables.
2 Electricityflows theelectricalcircuit.
3 Electricityflows thealternator thebattery.
4 Electricityflows thepositiveterminalofthebattery thestartermotor.
5 MatchanIfclausewitharesultclause.
Rewritethissentencewiththecorrectpunctuation.
iftheignitionisoffthestartermotordoesntwork◊→
6 Completethesentences.Usethepresentsimple,withorwithoutnot.
1 Ifthebatteryischargedandthelightsswitchison,current flows from the battery to the lights.(current/flow/battery/lights)
2 Ifthebatteryischargedandtheradioswitchisoff,
(current/flow/battery/radio)
3 Ifthebatteryisnotcharged,
(current/flow/startermotor/battery)
4 Ifthealternatorisbroken,
(current/flow/alternator/battery)
5 Ifnoelectricityflowsfromthealternatortothebattery,
(battery/becomeflat)
6 Ifthebatteryisflat,no
(electricity/flow/battery/startermotor)
7 Iftheignitionisoff,
(electricity/flow/around/electricalcircuit)
Ifclause
1 Iftheignitionison,
2 Ifthelightsswitchison,
3 Iftheignitionisoff,
Resultclause
a)electricitydoesnotflowfromthebatterytothestartermotor.
b)currentflowsfromthebatterytothelights.
c) electricityflowsaroundthecircuit.
Unit 5
J7260PEARSON Technical English
Automotive Industriesaw_05_02
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ignitionoff
J7260PEARSON Technical English
Automotive Industriesaw_05_03
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ignitionon
WordList7 Writethemeaningsofthesewordsandphrasesinyourownlanguage.
Unit 5
NOUNS
alternator
battery
cable
diode
generator
output
VERBS
charge
store
NOUNPHRASES
alternatingcurrent
directcurrent
electricalcircuit
ignitionkey
rectifierpack
startermotor
ADJECTIVES
negative
positive
ADVERBS
off
on
Automotive Industries
© Pearson Longman 2008 www.pearsonlongman.com/technicalenglish
Unit 5
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