WorksheetsForm 3 Chapter 6 65 Questions
Total questions: 65
Worksheet time: 1hrs 9mins
D is the symbol for
Main Substation
Power Station
Switch Zone
national Grid Network
E1 is the symbol for
Main substation
Branch substation
Switch Zone
Step-up transformer station
C is the symbol for
Main substation
Branch substation
Switch Zone
National Grid Network
Bn is the symbol for
Step-down transformer station
Power Station
Switch Zone
Step-up transformer station
A is the symbol for
Main Substation
Power Station
Switch Zone
national Grid Network
Bt is the symbol for
Step-up transformer
Step-down transformer
Switch Zone
National Grid Network
E2 is the symbol for
Main substation
Step-down transformer
Branch substation
National Grid Network
Electrical wiring in Malaysia consist of two different types, which are (a)
The single phase wiring is only suitable for electricity usage (a)
Give the correct term.
"A fine and short wire that heats up easily and melts when the current flowing through it exceed the value that supposedly"
(a)
Two types of fuse
(a)
Electric current is divided into two types, which are (a)
Give the correct term.
"A device used to show the pattern of a varying voltage"
(a)
Diagram shows the end of March reading on the meter of Abu’s shop.
What is the amount that Abu needs to pay if one kilowatt hour of energy costs 23 sen and the previous reading was 3120.4 units?
RM 201.02
RM 292.92
RM 398.45
RM 400.50
Diagram shows the components in a 3-pin plug.
Which component A, B, C or D is the earth wire?
A
B
C
D
Which of the following is a characteristic for a 3-pin plug?
I Used for electrical appliances with less than 1 A.
II Does not have fuse
III Is connected to live wire, neutral wire and earth wire
IV Direct leak current that flows through electrical appliance to Earth
I and II
III and IV
II and III
I and IV
Mei Ling got an electric shock while ironing her clothes. The following information shows the steps taken by his brother to help her.
P- Calls an ambulance
Q- Remove electrical source using an insulator
R- Switches off the main power supply
S- Perform mouth to mouth resuscitation if the victim is not breathing.
Which sequence is correct?
P, R, Q, S
R, Q, S, P
P, Q, R, S
R, Q, P, S
___________ disconnects the current supply temporarily when it is not needed (such as during repairing damaged wiring).
ELCB circuit breaker
Main switch
MCB circuit breaker
Electric meter
___________ cuts off the current supply in the house when excessive current flows through it.
ELCB circuit breaker
Main switch
MCB circuit breaker
Electric meter
___________ separates the final circuit into the other parts of electrical equipment like air conditioner circuit and controls the quantity of current flows through it.
ELCB circuit breaker
Main switch
MCB circuit breaker
Electric meter
If an electrical appliance uses current of 11 A, which is the suitable value of fuse to be used.
15 A
10 A
5 A
13 A
The main supply of electrical energy in a house has a voltage of
33 kV
240 V
415 V
621 V
Why is alternating current used instead of direct current in the transmission of electricity through long distances?
Only alternating current can flow through the cables.
Alternating current voltage can be stepped up or stepped down by using transformers.
Most of the electrical appliances work only with alternating current.
Generating direct current is more complicated than generating alternating current.
What is the function of live wire?
To carry electrical current from electrical appliance to substation
To carry leaked current to the ground
To carry electrical current from station to electrical appliance
melts when the current flowing through it exceeds the value of the fuse.
Which of the following uses single - phase wiring?
Industrial area
Shopping mall
Hotel
Homestay
What is the function of the National Grid Network?
Transmit electrical energy all over the country through high voltage cable network
Store voltage for emergency use
Collect and channel the electrical energy to the consumers
Lower the value of voltage to suit the supplied area
This car needs 8600J of energy to power it. If 5000J is changed into useful energy, how much energy is wasted?
13600J
3600J
5000J
8600J
What is the efficiency of the machine if the input is 263 J and the output is 142 J?
6.26%
185%
260%
54%
What is the work output of a machine that has a work input of 2,800 Joules and an efficiency of 92.3%?
2,690 J
0.0082 J
92.3 J
2,584.4 J
Tick some of the safety components in the Wiring System in Homes
Switch
Generator
ELCB
MCB
Socket
The diagram shows four transformers, A, B, C and D.
Which transformer is a step - up transformer?
A
B
C
D
An electric iron is rated 1050 W, 240 V.
Which of the following is a suitable fuse rating for the iron?
1 A
2 A
3 A
5 A
Which of the following is a problem related to electricity supply in life?
Our country is more dependent on non-renewable energy sources such as petroleum
Inefficient and ineffective use of electricity among the citizen
Malaysia Awareness on saving electricity is still low among Malaysians
Malaysia sells electricity to neighbouring countries to generate the economy
The diagram shows a common electrical device.
What are the safety features shown in the device.
Live wire
Earth wire
Neutral wire
Fuse
Fuse wire has a low melting point so that it can easily melt when high current passes through it.
FALSE
TRUE
A device had been installed in a circuit causing the reading of the voltage supplied in the circuit to increase from 20 V to 100 V.
What is the device?
Resistor
Dry cell
Transformer
Fuse
The electrical wiring system in a home has several safety features.
Which of the following are the safety features?
The main fuse
The colour codes for different wires
The Earth Leakage Circuit Breaker
Electric meter
An electrical appliance is marked 800 W, 240 V.
What is the cost of using the appliance for four hours daily for a week if the cost of a unit of electricity is RM 0.20?
RM 3.30
RM 4.48
RM 50.64
RM 205.23
Apakah fungsi pemutus litar bocor ke bumi (ELCB)?
What is the function of earth leakage circuit breaker (ELCB)?
Mengawal jumlah arus yang mengalir melalui litar di dalam rumah.
Controls the amount of current flowing through the circuit in the house.
Mengasingkan litar akhir ke bahagian peralatan elektrik.
Isolates the final circuit to the electrical appliances.
Memutuskan litar apabila berlaku litar pintas.
Disconnect the circuit in the event of short circuit.
Memutuskan litar apabila arus berlebihan mengalir melaluinya.
Disconnect the circuit when excess current flows through it.
Which of the following is an example of appliance using alternating power source?
A transformer has 100 turns in the primary coil and 25 turns in the secondary coil. When a 120 V is applied to the primary coil, what is the voltage in the secondary coil?
480V
30V
20V
450V
Calculate potential difference in the secondary coil based on the information given below.
Vp = 240 V
Np = 20
Ns = 125
Vs ?
1500
500
1000
2000
Electrical energy is transferred through ______________ in a transformer.
electric field
rotor
magnetic field
air space
The diagram shows how electrical energy is produced.
What does Q represent?
The water is heated until steam is produced and the turbine is rotated.
The water rotates a motor, which will then rotate a generator.
A mixture of steam and gas is heated until they expand and the turbine is generated.
The water rotates a turbine, which will then rotate a generator.
The diagram shows an apparatus.
Which of the following statements are true about the apparatus? (3 answers)
It is used to change a low input voltage to a higher output voltage
It alters the voltage of alternating current
It is used to change a high input voltage to a lower output voltage
It helps to reduce energy wastage during the transmission of electrical energy
Some energy source are renewable while some are non - renewable.
Choose on non - renewable energy sources.(2 answers)
Natural gas
Water
Geothermal
Coal
Which of the following is non - renewable source of energy?
Which of the following is not a renewable energy source?
Nuclear energy
Hydro energy
Biomass energy
Solar energy
Pilih satu atau lebih kenyataan yang benar mengenai transformer.
Select one or more statements that are true about transformers.(3 answers)
Transformer injak naik menaikkan voltan arus ulang-alik.
Step-up transformer raises the alternating current voltage.
Transformer injak turun mempunyai lilitan gegelung primer yang lebih banyak berbanding gegelung sekunder.
Step-down transformer has more windings on the primary coil than the secondary coil.
Transformer injak turun menurunkan voltan arus terus.
Step-down transformer lowers the direct current voltage.
Transformer injak naik mempunyai lilitan gegelung sekunder yang lebih banyak berbanding gegelung primer.
Step-up transformer has more windings on the secondary coil than the primary coil.
Di antara yang berikut, yang manakah yang BENAR mengenai transformer?
Which of the following is TRUE about transformer?
Transformer mengubah voltan bagi arus terus untuk memenuhi keperluan voltan yang berbeza.
Transformer changes the voltage for direct current to meet the different voltage requirements.
Transformer mengubah voltan bagi arus ulang-alik untuk memenuhi keperluan voltan yang berbeza.
Transformer changes the voltage for alternating current to meet the different voltage requirements.
Transformer hanya mampu menurunkan voltan ke nilai yang bersesuaian mengikut keperluan.
The transformer is only capable of lowering the voltage to the appropriate value as required.
Apakah perubahan bentuk tenaga yang terjadi ketika penghasilan tenaga elektrik dengan menggunakan petroleum atau gas asli?
What are the changes in the form of energy that occur when generating electricity using petroleum or natural gas?
Tenaga haba - tenaga kimia - tenaga kinetik - tenaga elektrik
Heat energy - chemical energy - kinetic energy - electrical energy
Tenaga keupayaan - tenaga kimia - tenaga haba - tenaga elektrik
Potential energy - chemical energy - heat energy - electrical energy
Tenaga kimia - tenaga kinetik - tenaga haba - tenaga elektrik
Chemical energy - kinetic energy - heat energy - electrical energy
Tenaga kimia - tenaga haba - tenaga kinetik - tenaga elektrik
Chemical energy - heat energy - kinetic energy - electrical energy
Which match is true about the type of generator and the fluid that spinning the turbine?
Thermal generator - High pressure steam
Hydro - The mixture of hot gas and air
Gas turbine - High pressure water
Diesel - The mixture of petrol and air
Diagram below shows a process to generate induced current through relative motion of the coil with magnet.
How to prove that the induced current has been generated?
The coil becomes hot
The bar magnet becomes hot and melt
The needle of Galvanometer deflects
The needle of the Galvanometer vibrates
Super heated steam is used to turn a ______________?
Transformer
Battery
Turbine
Toothed Gear
which type of renewable energy is currently creating the most electricity generation?
geothermal
hydroelectric
solar
wind
Which renewable energy sources that can be found in Malaysia?
I. Biomass
II. Water
III. Nuclear energy
IV. Geothermal energy
I and II
I and III
II and III
II and IV
What is the energy change involved in the power station?
Kinetic E. >>>Chemical E. >>> Electrical E.
Chemical E. >>>Potential E. >>>Electrical E.
Potential E. >>>Kinetic E. >>>Electrical E.
Electrical E. >>>Potential E. >>>Kinetic E.
Which of the following is step down transformer?
A
B
C
D
Which of the following is correct about three-phase wiring?
Not suitable for heavy industries
Not stable enough for electricity usage above 10kW
Suitable for rural residential area
More stable for commercial & industrial areas
The diagram shows a plug. What is X, Y & Z?
X - Earth wire
Y - Neutral wire
Z - Live wire
X - Live wire
Y - Neutral wire
Z - Earth wire
X - Earth wire
Y - Live wire
Z - Neutral wire
X - Neutral wire
Y - Earth wire
Z - Live wire
What is the function of P?
Disconnects the circuit when overcurrent flows
Carries leakage current to the ground
Carries electric current to the electrical appliance
Carries excessive electric current back to the main supply
Which fuse is suitable for the oven?
3A
5A
10A
13A
What is the function of fuse?
To break the circuit when excessive current flows through it
To carries excessive current to the Earth
To melt
To change the voltage
