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Revision elec tricity 201 3 PHYSICS FORM 5

1 AVan de Graaff generator can produces

A charge positive onlyB charge negative onlyC high voltageD large current

2 240 C charge flows in a metal conductor for 2minutes. What is the current in the conductor?A 40 A B !20 AC 2 A D ! AE 0." A

3 400 mA current flows for " second in a #ul#.

What is the $uantity of charge flows in the#ul#?A 2" C B !2." CC C D 4 CE 2 C

4 A current of %.4 A flows in a metal wire for 2

minutes. What is the num#er of electrons flowingin the wire?

&e ' !.% ( !0)!*C +A ,.2 ( !0!2 B 4. ( !0!2C .0 ( !0!2 D 4. ( !0!"

E 4. ( !0!"

5 Which of the following statement is correct a#outthe electric field?A -lectric field is a region around a neutral

o#ectB /he electric field lines of force always

cross overC -lectric field is a vector $uantityD /he electric field lines start on positive

charges and end on negative charges.

6 Which diagram shows the correct electric fieldpattern?

7 Which diagram shows the correct electric fieldpattern?

8 /he diagram shows a candle flame is placed inan electric field .

/he o#servation the shape of the flame is due

to

A the num#er of negative ions is greater thanthe num#er of positive ions

B the num#er of positive ions is greater thanthe num#er of negative ions

C negative ions is heavier than positive ionsD positive ions is heavier than negative ions

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2.1Analysing electric fields andcharge flow

TUTORIAL 2(a)


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10 An electronic device la#elled !2V 2A. What isthe resistance of the device?

A 0.%3 B %.0C 4.0 D !4.0

E 24.0

11 /he graph shows the results of an e(perimentto measure the resistance of a wire.

What is the resistance of the wire?.

A "00 B !000

C 2000 D 4000

E 000

12 Which of the following V)6 graph shows theresistance increasing as the current rises?

13 Which of the following has the highest

resistance?

7ength 8 cm 9.W.G

A !00 ,2

B !00 20

C "0 ,2

D "0 20

14 /he figure shows an electric circuit consists acooper wire oc1ey ammeter voltmeter anddry cell.

When the oc1ey is touched at a length 0."m on the

cooper wire the reading of ammeter and voltmeterare 4A and !2 V respectively. What is the reading ofthe ammeter when the oc1ey is touched at a length0.2m on the cooper wire?

A ,A B !0 AC !2 A D 24 AE ,% A

14 A piece of wire has diameter d and resistance:. When diameter of the wire is 2d what is theresistance of the wire.

A : B : 4 2

C : D 2:

E 4:

2.3Analysing series and

parallel circuits

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TUTORIAL 2(c)

1 /he figure shows ammeter reading in a circuit.Which ammeter is showing a faulty reading?

2 A #attery lights all four lamps as shown in the

following figure.Which lamp if removed would cause all thelamps to go out?

3 Which of the #ul#s in the following figure is the#rightest ?Given that all the #ul#s are identical.

4 Which of the following com#ination of switchesshould #e closed to ma1e only #ul# ;: and 9light?

A ! 2 ,B ! 2 "C ! , "D ! 4 "

5 When four identical resistors are connected in

series the effective resistance is 20 .

What is the effective resistance if the fourresistors are connected in parallel?

A 0. B !.2"

C ".0 D 20.0

E 0.0

6 When two identical resistors are connected in

parallel the effective resistance is 4 .What is the effective resistance if the tworesistors are connected in series?

A 2 B 4

C D !%

E 20

7 /he figure show the resistor com#inations ; and a resistor " >.

What is the effective resistance of resistorscom#ination?

A 2." B "

C !0 D !2."

E 2"

10 A current flows in two resistors connected inseries as shown in the following figure. A!and A2are the readings on ammeter V!and V2 are thereadings on the voltmeters.

Which of the following is correct?Ammeter reading Voltmeter reading

A A! A2 V! V2B A! A2 V!@ V2C A!' A2 V! V2D A!' A2 V!' V2

11 A current flows towards the unction of tworesistors connected in parallel as shown in thefollowing figure. A!and A2are the readings on

ammeter V!and V2 are the readings on thevoltmeters.

Which of the following is correct?

Ammeter reading Voltmeter reading

A A! A2 V!@ V2

B A! A2 V!2C A!' A2 V! V2D A!@A2 V!' V2

12 What is the reading of the ammeter in the

circuit a#ove when the switch is closed?

A 0., A B , AC 4 A D AE ,% A

13 What is the reading of the ammeter in thecircuit a#ove when the switch is closed?

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A 0.4 A B 0." AC !.0 A D 2.0 AE 2." A

14 /he diagram shows a circuit.

What is the reading of the ammeter when theswitch 9 is opened and closed?

9witch 9is opened

9witch 9 isclosed

A 4.0 A %.0 AB 2.0 A %.0 AC 2.0 A ,.0 AD 2.0 A !.2 A

!" /wo resistors 4is connected parallel asshown in igure &a+ and the current 6!flows.7ater the resistor resistors 4is connected

series l as shown in igure + and the current 62flows.

What is the ratio 6! B 62 ?

A ! B 2 B ! B 4C 2 B ! D 4 B !E 2 B ,

16 /he figure shows a circuit. When the switch 9 isopened and closed the reading of the ammeteris 6!and 62respectively.

What the ratio of 6!B !2?

A ! B ! B ! B 2C ! B , D 2 B !E , B !

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17 What is the reading of the ammeter in thecircuit a#ove when the switch is closed?A 2 A B 4 A

,C , A D ! A

2E ! A

2

18 6n the following circuit the reading of theammeter A!is !2 A.

What is the reading of the ammeter A2 ?

A * A B AC %A D ,A

E !A


What is the value of current 6!and 62?A 6!' 0.4A 62 ' 0.4 AB 6!' 2.0A 62 ' 0." AC 6!' 0."A 62 ' 2." AD 6!' 2."A 62' 2." A

20 What is the reading of the voltmeter in thecircuit a#ove when the switch is closed?A .0 V B 3. VC %. V D ". VE 4. V


What is the potential difference across the

resistor2?

A 2 V B 4 VC % V D V

E !0 V22

What is the reading of the voltmeter in thecircuit a#ove when the switch is closed?A 2.0 V B 4.0 VC %.0 V D !2.0 VE 24.0 V

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2.4! Analysing

electromotive force and

internal resistance.


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1 Which of the following physical $uantity has thesame unit as the unit of the electromotive force?A CurrentB -nergyC :esistanceD ;otential difference

2 When the switch 9 in the following figure isopened the voltmeter reading is !." V. When theswitch 9 is closed the readings of voltmeter andthe ammeter is !., V and 0.2 A respectively.

What is the internal resistance of the cell?

A 0.! B 0.,

C 0.% D !.0

E !.2

3 /he figure shows a dry cell with an electromotiveforce of ,.0 V and a resistor ,.

When the reading of the ammeter is 0." Awhat is the internal resistance of the cell?

A 4.0 B ,.0

C 2.0 D !.0

E 0."

4 /he figure shows a #attery is connected to a

resistor". When the switch 9 is opened the

reading of the voltmeter is !4.3 V. When the

switched 9 is closed the reading of thevoltmeter is !4V.

What is the internal resistance of the #attery?

A 0." B 2.0

C ,.0 D 4.0

E 4."

5 /he figure shows a circuit containing threeresistors 2and a cell with an electromotive

force of !2 V and internal resistance of %.

What is the current flowing through the circuit.A !.! A B !.2 AC !., A D !.4 AE !."A

6 /he figure shows a circuit containing tworesistors %and a cell with an electromotive

force of !2 V and internal resistance of ,.

What is the current flowing through each resistor

%?

A 0." A B !.0 AC 2.0 A D ,.0 AE 4.0 A

7 /he figure shows a circuit containing tworesistors !0 a resistor 20 a cell with e.m.f

of !." V and internal resistance of 2.

!

TUTORIAL 2(")


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What is the reading of he voltmeter?A 0.2, V B 0.4% VC !.2" V D !."0 VE 2.00 V

8 An accumulator produce a current 0.% A when it

is connected to a resistor 2. When the same

accumulator is connected to a resistor 3the

current is produced is 0.2 A.What is the e.m.f and the internal resistance ofthe accumulator.

A !.0 V !.0 B !." V 0."

C 2.0 V 0." D 0." V !."

E !.0 V !."

9 A cell produces a current 0." A when it is

connected to a resistor 2. When the same

accumulator is connected to a resistor 4the

current is produced is 0.4 A.What is the e.m.f of the cell?A !.% V B 2.% VC ,.0 V D 4.0 VE 4." V

10 igure&a+ shows a circuit to determine the e.m.fand internal resistance of a cell. igure +shows the e(periment is repeated #y using thesame cell.

What is the internal resistance and theelectromotive force of the cell?

6nternal

resistance 8

-.m.f 8 V

A 0.2" !."

B 0."0 ,.0

C !.00 ,.0

D !.2" 4."

E !."0 4."

!1 Which circuit can #e used to determine theelectromotive force a #attery?

12 Which of the following graphs relates thereading of ammeter and the voltmeter in figurea#ove?

"

2.5Analysing electrical

energy and power


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1 /he potential difference across a resistance is%.0V and the current flows to the resistance is0.2 A for 2 minutes. What is the energy isproduced in the resistance?

A %0 B !20 C !44 D 240 E 40

2 !" of energy is produced in a torch light #ul#when the current flows through the #ul# for!0 s.What is the potential difference across the#ul#?A 0." V B !." VC ,.0 V D 4." VE %.0 V

3 /he figure shows a circuit containing tworesistors and a #attery.

What is the energy dissipated per second in the

resistors 4and ?

A % B ,

C !.0 D 0." E 0.!

4 ase on the figure a#ovewhat is the energy

dissipated in the resistor in 2" second?

A ,%0 B 2 C 32 D ,%

E !

5 When the reading of the ammeter in the figurea#ove is 2 A calculate the energy generated in#oth of the resistors for every second.A 0." B !." C ,.0 D 4." E %.0

6 ased on the information in the figure a#ove

determine the energy dissipated in resistor ,

for " second?A ,0 B 40 C "0 D %0 E *0

7 A #ul# is la#elled % V 0.% A. What is the powerof the #ul#?A 0.0" W B ,.% WC !0 W D 20 WE 40 W

8 A filament #ul# is la#elled 240 V %0 W.What is the current flows through the filamentand the resistance of the filament?

A 0.2" A %0 B 0.2" A*%0

C 4.0 A %0 D 4.0 A *%0

E ".0 A !%0

9 A current of 2 A flows in filament #ul# . /he

resistance of the filament is ". What is the

power generated #y the lamp?A 20.0 W B !0.0 WC ".0 W D 2." WE 0." W

10 /he figure shows a circuit.

10

TUTORIAL 2(#)


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ased on the circuit a#ove what is the readingof the ammeter when the switch is closed?

A ! A B 4 AC " A D * AE !2 A

11 /he 1ilowatt ) hour is a unit of

A charge B energyC power D voltage

12 A 2 1W electric fire is used for hours. =ow longwill it ta1e a !00 W electric light #ul# to use thesame amount of energy?A 20 hours B "0 hoursC !00 hours D 200 hoursE 400 hours

13 our electrical appliances are left switched onfor different times.

6n which appliance is the greatest amount ofenergy converted?

Appliance /imeA , 1W water heater 0." hourB !." 1W hot)plate !." hoursC ! 1W fan , hoursD 3"0 W electric iron ! hour

14 Why is a fuse used in electrical appliance?A /o earth the applianceB /o protect the appliance and its ca#leC /o change the efficiency of the appliance

D /o change the current rating of theappliance

15 /he fuse rating for a fuse used in the plug of anelectrical heater should #eA much less than the normal heater currentB ust less than the normal heater currentC e(actly e$ual to the normal heater currentD ust greater than the normal heater current

16 An electric heater mar1ed D 240V 2., 1W E.With fuse is most suita#le to connect series to

the heater?A "A B 3AC A D !0 AD !, A

17 A television is la#elled 2"0 W 240 V is used "hours per day in one month.6f the cost of electricity is 24 sen per unit whatis the cost of operating the appliance in themonth of une?

A :F".00 B :F%.00C :F.00 D :F*.00E :F!2.00

18 /he ta#le shows the electrical energyconsumption tariff.

-lectrical units Cost per unit &sen+

irst 200 units 22

9econd "00 units 2"

Calculate the cost in :F of using a !." 1Wrefrigerator for ,%0 hours.A 4.00 B *0.00C !!.0 D !2*.00E !,".00

19 /he ta#le a#ove shows the electricity tariffs fordomestic use. /he reading of an electricity meterreading in a house in the month of August is%020 and in the month of 9eptem#er is 34"0.

-nergy consumption :ate&sen8unit+

irst !00 units 20 sen

e(t *00 units 2" senver !000 units ,0 sen

What is the cost of electricity is used in thehouse ?

A :F420 B :F,34C :F22 D :F!%E :F 3%

20 A fluorescent lamp with a power rating of 40 Wproduce ,% W of light energy.What is the efficiency of the lamp?A 4H B 32HC 3%H D "H

D *0H21 An electric motor is used to lift a load of mass "0

1g to a height 2 m in !0 s. /he supply voltage is2" V and the flow of current in the motor is ".0A .What is efficiency of the motorA %0H B 3"HC 0H D "HD *0H

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