Automotive Industries

© Pearson Longman 2008 www.pearsonlongman.com/technicalenglish

J7260PEARSON Technical English

Automotive Industriesaw_05_01

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Frame

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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OFF

ignitionoff

J7260PEARSON Technical English

Automotive Industriesaw_05_03

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OFF

ON

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