chapter 7 p2

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ELECTRICITY:TRIAL EXAM QUESTIONS

7.1 CURRENT & ELECTRIC FIELDS

1. Melaka Mid year 09: Question 8

Diagram 8.1 shows an apparatus set upto observe a pattern of electric field.

(a) (i) What is meant by electric field?

.....................................................[1 mark]

(ii) In the space below, drawelectric field pattern formed bythe apparatus arangement onDiagram 8.1.

[2 marks]

(b) A current of 0.2 A is let to flow for3 minutes.Calculate(i) Quantity of charge carried

by the current[2 marks]

(ii) Number of electrons flow in3 minutes.

[1 mark]

(c) Q, R and S are three set ofapparatus to observe electricfield.

Set ofapparatus

Type ofpower

supply

Type ofelectrode

Typeof

liquidQ Dry cell Glassrod

Oliveoil

R Extrahigh

tension

Metal Oliveoil

S Lowvoltagesupply

Carbon Oliveoil

Based on Table 8, state the suitable

properties for the set of apparatus toobserve the pattern of the electric field.(i) Type of power supply

....................................................Reason

....................................................[2 marks]

(ii) Type of electrodes

...................................................Reason

....................................................[2 marks]

(d) Based on the answers in 8(c,which set of the apparatus is themost suitable to observe theelectrid field?

..........................................................

[1 mark](e) State one reason why olive oil isused as liquid for the experiment.

..........................................................[1 mark]

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7.2 RELATIONSHIP BETWEENCURRENT AND VOLTAGE

2. Question 1: MRSM 08Diagram 1 shows an electric cwhich is used to investigate t

relationship between electricand potential difference acrosconductor XY.

(a) What is the function of thvoltmeter?

.............................................

(b) Underline the correct ansbracket to complete the sbelow. When the electric

increases,(i) The potential differ

(increases, decreasunchanged)

(ii) The resistance will (decrease, remain u

(c) State one physical quan

is kept constant in theexperiment.

.........................................

ircuite

urrents a

..............[1 mark]

er in thentenceurrent

nces, remain

[1 mark]

increase,changed)

[1 mark]

tity which

.................[1 mark]

3. Qustion 2: JohorDiagram 2.1 shows twoP and Q of the same ledifferent cross-sectionused to carry out an ex

Initialy, the experimentwith P placed acros XY.replaced with Q and th

repeated. The V-I graphshows the results obtaiexperiment.

(a) Based on Diagramthe cross sectinaland Q.

................................

(b) Based on Diagra(i) State how th

the constantobtained.

.......................

9constantan wiregth but ofl area, beingeriment.

is carried outAfter that, P is

experiment is

in Diagram 2.2ned from the

2.1, comparerea of wires P

............................

[1 mark]2.2:resistance of

nt wire can be

............................[1 mark]

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(ii) Determine the resisconductor Q. Showgraph.

[

4. Question 4: Kelantan 09

Diagram 4.1 shows a circuit uinvestigate the relationship becurrent and potential differena constantants wire s.w.g 24of 10 cm.

(a) Name the measuring instlabeled X and Y in Diagra

X = ..................................

Y = ..................................

(b) (i) What is the relationshithe reading of the mea

instruments X and Y?

.......................................

(ii) State the physics law iin 4(b)(i)

......................................

(c) The experiment is repeusing a constantan wirewith the same length. D4.2 shows the graph V afor the experiment.

ance ofon your

marks]

ed totweene accrossith length

umentsm 4.1

[2 marks]

betweensuring

.................[1 mark]

nvolved

................[1 mark]ted bys.w.g 36

iagramgainst T

Based on graph in Diag(i) What is the p

represented bthe graph?

........................

(ii) Which of thehas the higheWhy?

........................

5. Question 8: Keda(a) State Ohms law

.................................

(b) Diagram 8.1 showscurrent, I, against pdifference, V, of a d

ram 4.2;ysical quantity

y the gradient of

............................[1 mark]

onstantan wiret resistance?

............................[1 mark]

08

...........................

[1 mark]a graph ofotentialiode.

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(i) State whether the ohmsobeyed by the diode.

..........................................

(ii) Give a reason why therecurrent flowing throughwhen the potential differbetween 0 V and -2 V.

..........................................

(iii) What is the resistance ofwhen the potential differV?

(c) Identical light bulbs, earesistance R are connectecircuits as shown in Diagram

The rheostat in each circuit isand the potential difference, Vcurrent, I, graphs are plotted fcircuit. The graph for each cirshown in Diagram 8.3

law is

.................[1 mark]

is nohe diodence is

.................[1 mark]

the diodence is 2

[2 marks]

h ofin three

8.2.

adjusted, against

r eachcuit is

(i) Match the graphthe circuits X, Y

CircuitX

YZ

(ii) Explain your an

.............................

.............................

(iii) Calculate the val

7.3 SERIES AND PARA

6. Question 3: KelaDiagram 3.1 shows a pelectric circuit. The cirfour identical bulbs conidentical new dry cells.

Diagram

(a) What is the type of

................................

s K, L and M toand Z.

Graph

[3 marks]

wers in (c)(i).

............................

...........................[2 marks]

ue of R.

[2 marks]

LEL CIRCUIT

tan 08otograph of anuit containsnected to four

.1

the circuit?

.............................[1 mark]

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(b) Draw an electric circuit diagram forthe above arrangement ofapparatus using appropriatesymbols.

[2 marks](c) Compare the brightness of the

lamps J, K, L and M. Tick (

) onebox below.

....... The brightness of lamp J >lamp K > lamp L > lamp M

....... The brightness of lamp L >lamp K > lamp J > lamp M

....... The brightness of lamp J =lamp K = lamp L = lamp M

[1 mark]

(d) Give one reason for your answer in(c).

.............................................................[1 mark]

(e) Explain why the circuit above isused in the house lighting circuit.

............................................................[1 mark]

7. SBP 09: Question 8Diagram 8.1 and Diagram 8.2 showsthree identical filament bulbs marked6V, 12W arranged in two different waysand connected to a battery 6 V .

Diagram 8.1 Diagram 8.2

(a) What is meant by 6V,12W ?

.......................................................[ 1 mark ]

(b)State the type of circuit inDiagram 8.1 and 8.2

Diagram 8.1: ..........................

Diagram 8.2: ...........................[ 2 marks ]

(c) The bulbs in Diagram 8.2 arebrighter than the bulbs inDiagram 8.1. Explain youranswer .

......................................................

......................................................[ 2 marks]

(d)The resistance of each bulb inDiagram 8.1 and Diagram 8.2 is4 . Determine the current flowin each bulb.Diagram 8.1:

(i) Diagram 8.2:

[ 4 marks]

(e)A student wants to design anincubator. Bulbs are used toheat up the incubator.(i) Between the circuit in

Diagram 8.1 and in Diagram8.2, which circuit is the mostsuitable to be used by thestudent to heat up theincubator.

................................................[1 mark]

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(ii) Give two reasons fanswer in 8(e)(i).

.................................

.................................

7.4 ELECTROMOTIVE FORINTERNAL RESISTANC

8.Figure 10.1 (a) and Figure 10.2two circuits used to investigatrelationship

between potential difference aelectric current.Figure 10.1(b) and Figure 10.2the potential difference againscurrent graph respectively for10.1(a) and Figure 10.2(b).

(a) What is meant by electric

V

0

0

V

V

Figure10.1 a

V

Fi10

0

0

Figure10.2 a

F1

r your

................

................[2 marks]

E ANDE

(a) showe the

nd

b) showt electricFigure

urrent?

(b) Compare the placevoltmeter in FigureFigure 10.2(a). Therelationship betwe

difference and curgraphs. Explain thin both graphs. Herelated physics laapplicable in each

7.5 ELECTRICAL ENER

9. Question 7: Keda

Diagram 7 shows an ellifting a 2.0 kg load. Wswitched on, the load mheight of 1.5 m in 2.5 sspeed. The current flocircuit is 1.7 A and thedifference across the m

(a) State the changesoccure when the mon.

................................

(b) Calculate:(i) The electri

supplied wlifting the l

I

I

ure.1(b)

igure0.2(b)

[ 1 mark ]

ment of the10.1(a) and

n compare then potential

ent for bothresults shownce state theand concepts

situation.

[ 5 markah ]

GY

09

ctric motoren the motor isoved through a

ith constanting in theotential

otor is 10.0 V.

in energy thatotor is switched

.............................

[1 mark]

al powerhen the motor isoad.

[2 marks]

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(ii) The output powermotor when the lmoved throught1.5 m in 2.5 s.

(iii) the efficiency of tmotor.

(c) If some of the load is rewhile the motor is still liload, what change i obsthe ammeter? Explain

answer.

.........................................

.........................................

(d) Suggest one way to incefficiency of the motor.

.........................................

10.Question 8: Johor 07Diagram 8.1 shows an electricspecification of 240 V, 1000 W

DIAGRAM 8.1

(a) What is meant by specificV, 1000 W?

of theadheight of

[2 marks]

he eletric

[2marks]

ovedfting theerved onour

.................

.................

ease the

.................[2 mark]

iron with.

tion 240

..

.....

(b) The electric iron is240 V supply and uclothes for 30 minu

Calculate:(i) the current thatthe heating elem

(ii) the cost of usingin 30 days, if theelectricity by Te23 cents per kW

units.

(c) A student conductsto compare the heabread toasters P, Qslices of bread is toTable 8.1 shows thexperiment.

Breadtoaster

Potentialdifference,

V/v

C

P 240Q 240R 240

TABLE

[1 mark]

onnected to aed to irones.

asses throughent in the iron.

[2 marks]

the electric ironcost ofaga Nasionalis

h for first 200

[2 marks]

an experimenting effect ofand R. Twoasted each time.

result of the

urrent,I/A

Time totoast 2

slices ofbread,

t/s6.0 905.0 1504.0 120

8.1

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(i) Calculate the energy sueach of bread toaster tobread.

(ii) Using your answer in (which bread toaster issuitable. Give two reasyour answer.

..........................................

11.Question 8: Trengganu 0Diagram 8.1 shows an electricwith specification of 240 V, 1.2

(a) What is meant by the lab1.2 kW?

............................................

(b) Calculate

(i) the current flows throelectric kettle.

pplied bytoast the

[4 marks]

)(i), statemostons for

...........

.................[3 marks]

8kettlekW.

l 240V,

.................[1 mark]

ugh the

[2 marks]

(ii) the resistanceelements in th

(c) Four electric kettlewith specificationmade from the matdifferent characterishows the charactmaterials.

Kettle

The charathe materi

in the heatiin the

Boilingpoint

/oC

W 3501

X 1085

Y 3387

Z 1064

(i) Based on the chthe heating elem8.1, suggest twoare suitable to hthe reason for y

............................

............................

............................

of the heatinge kettle.

[2 marks]

s W, X , Y and Z40 V, 2 kW are

erials withstics. Table 8.1ristics of the

teristics ofls are used

ng elementkettle

esistivity/

10-8 mFuse

13.5 8A

5.2 10 A

12.4 10 A

4.63 8A

aracteristics ofents in Tableelectric kettlesat water. Giveur answer.

...........................

...........................

..........................[3 marks]

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(ii) Based on the fuse used in theTable 8.1 , suggest two electrickettles are suitable to heat water.Give the reason for your answer.

.......................................................

........................................................[2 marks]

(iii) Using your answer in (b)(i) and(b)(ii), suggest which electrickettle is the most suitable toheat water. Give the reason foryour answer.

........................................................

........................................................[2 marks]

12.Melaka 09: Question 8Diagram 8.1 shows an electric motorused to lift a load.

(a) State the energy transformationwhen the switch is closed.

..........................................................[1 mark]

(b) The mass of the load is 1.5 kgand is lifted to a height 1.5 m in5.0 s. The reading of the ammeter

is 1.2 A and the reading of thevoltmeter is 5.0 V.Calculate(i) Input energy to the motor

[2 marks]

(ii) Output energy of themotor.

[2 marks]

(c) Computer, air condition andwater heater are common home

electrical appliances. Table 8shows the power rating and thetime consumption for a day forthese electrical appliances.

Appliance Power,PW

Time, tHr

Voltage,V

Computer 200 1 240

Air

condition

200 1 240

Waterheater

3 800 240

Calculate energy consumption for eachelectrical appliances for one week.

(i) Computer

(ii) Air condition

(iii) Water heater[5 marks]

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(i) make the cabin wiring moreeffective

(ii) protect electric appliances fromdamage

(iii) prevent electric shock

(iv) increase energy efficiency

[10 marks]

14.Trengganu 07:Section BDiagram 10.1 and Diagram 10.2 showtwo identical resistors which hasresistance R connected to theammeters, voltmeters, switches andbatteries with different ways.

Diagram 10.1

Diagram 10.2

When the switch is on, the ammetersand the voltmeters show a reading.

(a) What is meant by current?[1 mark]

(b) With reference to Diagram 10.1and Diagram 10.2, compare thetype of circuit connections, thereading of ammeters, the readingof voltmeters and the effective

resistance of the circuits.Relate the current flows in a circuitwith the effective resistance tomake a deduction regarding therelationship between type of acircuit connection and theeffective resistance.

[6 marks]

(c)One identical resistor isconnected parallel to theresistors in Diagram 10.2. Explainwhat happens to the reading ofammeter and voltmeter.

[3 marks]

(d)Diagram 10.3 shows the lamps ina domestic lightning circuit areconnected in parallel.

Diagram 10.3

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The circuit is not complete anefficient for electrical energyconsuming and less safety.Suggest modifications that nedone to the circuit to improveproduce the lamps lights up w

normal brightness and to increfficiency of electrical energyconsuming.

15. Kedah 07 (Section C)(a) Draw a diagram to sho

resistors can be conneseries.

(b) A student plans to fix ahis room. Table 12.1 shfeatures of 4 different tylamps.

Type oflamp

Po-werP/W

Effi-ciency

Lifspa

houCompact

fluorescentlamp

18 50 % 700

Filamentlamp

75 12 % 100

Longfluorescent

lamp

20 45 % 140

Roundfluorescent

lamp

24 40 % 100

Explain the suitability of eachTable 12.1 and then determin

suitable lamp to be used. Givfor your choice.

(c) A 5 resistor and a 10are connected in parallpower supply.

not

ed to besafety,ith

ases the

10 marks]

how 3ted in

[1 mark]

lamp inws the

pes of

nrs

price

0 High

0 Low

0 Medium

0 high

feature inthe most

a reason

[10 marks]

resistorl to a 9 V

Calculate

(i) the effective resist

(ii) the current in the 5

(iii) power dissipatedresistor.

16.Understanding: TDiagram 12.1 and 12.2identical bulbs connectand two dry cell respecconnected to two dry cbrighter

DIAGRAM

(a) (i) What is meant bylabelled on the d

(ii) Explain why theto two dry cells i

nce,

resistor,

y the 10

[5 marks]

knik 07shows twoed to one cellively. The bulblls lights up

12.2

the value 9 V y cell?

[ 1 marks ]

bulb connectedbrighter.

[ 3 marks ]

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17.Section B: N9 08The lamps in a house are conparallel to the main supply.Diagram 10 shows two bulbsconnected to a switch and a d(i) Based on Diagram 10, dra

electric circuit diagram inanswer sheet.[3 m

Diagram 10Rajah 10

(ii) Each bulb is labelled 1.5VWhat is meant by 1.5V , 3

[2

(iii) Compare the brightness oand bulb B, when the swit

[1

(iv) Determine the current in twhen the switch is on?

(v) Calculate the energy consthe two bulbs if they are s

on for 1 hour.

(b) As an engineer you are gitask of determine the typewire that is suitable to beconnecting electric devicehouse.

ected in

arery cell.w the

your

rks]

, 3W.W ?

arks]

f bulb Ah is on.

marks]

he circuit

[2marks]

med byitched

[2marks]

en theofsed for

s in a

Explain the suitabilfollowing aspect of

(i) resistance of w(ii) melting point o(iii) density of wire

(iv) rate of rusting(v) rate of expansi

18.Section B: JohorDiagram 10.1 and Diathe bulbs connection aThe bulbs and the batstore are identical.

Diagram 1

Diagram 1

ity of thethe wire.

iref wire

f wireon of wire

[10 marks]

8gram 10.2 showt the fruit stores.tery in both the

0.1

0.2

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(a) (i) What is meant by a potdifferent?

(ii) Draw a circuit diagram

circuit and label the typcircuit.

(b) Using Diagram 10.1 andcompare the brightnessbulbs. Relate the brightthe bulb, the potential dand the current flow forto deduce a relevant phconcept.

(c) Diagram 10.3 shows ankettle which is a rated a2 000 W and connectedflexible cable to a three-

Suggest modifications thmade to the electric kettlDiagram 10.3 so that it cwater faster and has bett

ntial

[1 mark]

for each

of

4 marks]

10.2,of theess of

ifferentthe bulbssics

[5 marks]electric240 V,

by apin-plug.

at can bee inn boil

er safety.[10 marks]

19.Section C: Melaka(a) Diagram 11.1 (a) sh

bulb labeled 240 VDiagram 11.1 (b) shpotential difference

for two materials, Ythe materials will bfilament in a bulb.

i) What is meant by

ii) Based on the grap(b), compare the rematerials Y and Z.

Choose the more sto use as a filamenExplain your choic

b) As a researcher, ystudy the charactematerial to make aof a water heater.four choices of heK, L and M. Table

characteristics of telements.

08ows a filament. 80 W.ows a graph ofagainst current

and Z. One ofchosen as

240 V, 80 W?[1 mark]

in Diagram11.1sistance of

uitable materialt of the bulb.e.

[4 marks]

ur duty is toristics of aheating elementou are giventing elements J,

shows the

he four heating

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You are required to detmost suitable heatingelement.Study the specof all the four metals bathe following aspects.

- The cross sectional a- Melting point- Specific Heat Capaci- Length of the heatin

c) Three resistors with resist

2 , and 3 respectively aconnected to 6 V battery ain Diagram 11.2.

Based on Diagram 11.2Calculate

(i) Effective resistance

(ii) Power dissipated byresistor

rmine the

ificationssed on

rea

tyelement

[10 marks]

ance 1 ,

es shown

2

[5 marks]

20.Section C: TrenggDiagram 12.1 shows acoated with thin metal fbetween a pair of parallWhen the EHT is switchfield is formed in betwe

disc.

(a) What is meant by

(b) Explain what willping pong ball wto touch the metto positive termi

(c) Diagram 12.2 shocircuits K,L,M anarrangement of bsockets. The curused in wiring aYou are requiredmost suitable cirand supply the elthe booth. Study

circuits based onaspects.(i) Safety feat(ii) Arrangem

power soc(iii) Position of

meter and

anu 09ing pong ball

oil placedel metal disc.ed on an electricen the metal

electric field?[1 mark]

happen to theen it is broughtl disc connectedal of EHT?

[4 marks]

ws four electricN with different

ulbs and powerrent is to beuard booth.

to determine theuit to light up

ectrical power toall the four

the following

rent of bulb andetsthe kilowat-hour

main fuse.

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(d) An electric toasteelement of resistacurrent flowing thuse is 9 A.

(i) State the suitatoaster(ii) Calculate

- The supplied- The power d

toaste

21. Johor 09: SectionDiagram 12.1(a) and Dishow photographs of t

circuits. Each circuit cidentical dry cells of e.resistor R and an amm

r has a heatingnce 26.7 . Theough it while in

ble fuse for the

voltageissipated by the

[5 marks]

Cgram 12.1(b)o electric

ntains two.f 1.5 V, ater.

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(a) What is meant by e.m.f? [1 mark]

(b) (i) Draw two electrical circuitdiagrams for photographs inDiagram 12.1(a) and Diagram12.1(b). [2 marks]

(ii) Name the dry cells connectionfor Diagram 12.1(a). [1 mark]

(iii) State the advantage of Diagram12.1(b) as compared to Diagram12.1(a). [1 mark]

(c) Table 12 shows four lamps P, Q,R and S with different

specifications. You are asked toinvestigate the characteristic ofthe lamps as shown in Table 12.Explain the suitability of eachfeature of the lamp in Table 12.Determine the most suitable lampto be used as a reading lamp.Give reasons for your choice.

[10 marks]

Lamp P

CostRM 70

Power rating3000 W, 240 V

efficiency 75 %

Life time:4000 hours

Lamp Q

CostRM 30


efficiency 80 %

Life time:8000 hours

Lamp R

CostRM 15


efficiency 60 %Life time:6000 hours

Lamp S

CostRM 10


efficiency 50 %Life time:1000 hours

(d)The power rating of lamp P is 200 W,240 V.(i) State the change of energy in

lamp P. [1 mark]

(ii) Calculate the electric currentand resistance for lamp P.[4 marks]

22. Mid-year Melaka 09: section CDiagram 11.1 shows a rheostat.Rheostat is a common device used inthe laboratory.

(a) What is the function of therheostat?

[1 mark]

(b) State one factor which effects thechanges of the resistance in therheostat.

[1 mark](c) Explain the working principle of therheostat .

[3 marks]

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(d) Diagram 11.2 shows an electrickettle used to boil water.

Table 11.3 shows the specifications offour wires of the same diameter that canbe used as a heating element of an

electric kettle.

Type DensityKgm-3

Meltingpoint /C

Oxid-tionrate

Resistivity/ m

J 6 500 7 500 High 8.0 x 10-7

K 7 000 8 050 high 7.0 x 10-7

L 5 000 8 500 low 5.0 x 10-7

M 2 500 9 000 low 8.0 x 10-7

You are required to determine the most

suitable wire and explain the suitabilityof the of the following aspects.- Density- Melting point- Oxidation rate- Resistivity

[10 marks]

(e) Diagram 12.3 shows a graph ofcurrent against voltage for wire Aand wire B.

Based on Diagram 12.3(i) Name the wire with abigger diameter.

[1 mark]

(ii) If the resistance of wireA is R1 and resistance ofwire B is R2, determinethe ratio of R1 : R2.

[4 marks]

23. MRSM 09: section CA typical torchlight with batteries isshown in Diagram 12.1.

(a) (i) Name the type of current usedin the torchlight. [1 mark]

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(ii) Draw a circuit diagram forthe torchlight in Diagram12.1 [3 marks]

(b) Table 12.1 give details of theelectricity used by three electricalappliances in a household with a240 V mains power supply.

Appliance Appliancespecification

Durationswitched

on perday

(hours)Refrigerator 240 V,

1 kW

24

Airconditioner

240 V,1.2 kW

10

Washingmachine

12 2

The electricity tariff for domestic useis given in Table 12.2Electrical energy Cost per unit

(RM)

First 100 units 0.20Second 100 units 0.29Above 200 units 0.25

Calculate,(i) The total energy consumed in

one day.(ii) The total energy consumed by

the appliance in on month (30days).

(iii) The total cost in one month

(30 days) [5 marks]

(c) Energy efficiency and safety areimportant considerations in thepurchase and use of electrical

products and appliances.(i) A fuse in a power plug is labelled8 A. What does the label 8Amean?

(ii) Table 12.3 shows four types ofpower socket remains extensionP, Q, R and S available in asupermarket.You are asked to evaluate thecharacteristics of the four power

socket extensions for normalhome use. Study the picturesand the specifications for thefollowing aspects.- Safety- Energy efficiency- Control of electrical

applianceUsing physics concept, explainthe suitability of the powersocket extensions for eachaspect. Determine the mostsuitable socket extension andjustify your choice.

[10 marks]

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chapter 7 p2

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