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WorksheetsNational Grid Network
Total questions: 18
Worksheet time: 10mins
Electricity is generated at a .......
power station
petrol station
power source
source of energy
Transformers on distribution poles .............. voltage for use in homes.
step down
step up
step right
step left
Electricity is sent over ............... transmission lines.
low voltage
no voltage
high voltage
Transmission ................ carry the transmission lines
poles
transformers
boxes
pylons
If the current is transmitted at high voltage...
less energy is lost
more energy is lost
it produces alternating current
underground cables are used
Generators normally produce...
Alternating current
Direct current
Which of these might spin a generator at a power plant to produce electricity?
wind
water
steam from burning coal
all of these
Below is the advantages of grid systems in power system except:
Economy
Stability in operation
Service continuity
Increase Power Storage
In a thermal power plant, coal, oil, natural gas or uranium are used to heat what?
water
oil
air
the turbine
Energy production in thermal power plants as well as with hydroelectric, wind and wave or tidal power all produce electricity by
turning a turbine that runs the generator to make electricity that is taken to homes and businesses through transmission lines
the energy source directly runs the generator that then turns a turbine which produces the electricity that is taken to homes and businesses through transmission lines
the energy source is converted by a heater then the electricity is sent out to the homes and businesses through transmission lines
the energy source is used to power batteries that store energy, when you flip on a light or run electricity at your home, the battery sends the energy through transmission lines.
The main problems in transmitting the electrical current are:
high voltage in the transmission cables
high current in the transmission cables
high resistance in transmission cables
high resistance, current and voltage in transmission cables
E) high resistance and current in transmission cables
National Grid Network consists of
Power stations - step-up transformers - transmission lines - step-down transformers - consumers
Power stations - transmission lines - step-up transformers - consumers - step-down transformers
Power stations - step-down transformers - transmission lines -step-up transformers - consumers
Power stations - step-up transformers - consumers - transmission lines - step-down transformers
Voltage supply by various consumers in Malaysia. Which one is correct??
Heavy Industries = 120 kV
Light Industries = 11 kV
Residential area = 400 V
Offices = 900 V
Which number of turns of primary and secondary of transformer is suitable in order to stepped up the voltage from 25 kV to 132 kV ?
primary: 1000 turns
secondary: 52,800 turns
primary : 55,000 turns
secondary : 1000 turns
primary: 2,500 turns
secondary: 13,200 turns
primary : 13,200 turns
secondary : 20,500 turns
Which number of turns of primary and secondary of transformer is suitable in order to stepped down the voltage from 11 kV to 240 V ?
Primary : 11,0000 turns
Secondary: 240 turns
Primary : 240 turns
Secondary: 11,000 turns
Primary : 1100 turns
Secondary: 240 turns
Primary : 240 turns
Secondary : 24 turns
What is the advantage of electricity transmission at high voltage?
Increase the energy
High current flow
Reduce the heat dissipated in the electrical cable
Reduce the resistance of transmission cable
What is magnitude of voltage and type of current in the transmission cable
Magnitude of voltage: High
Type of current : Direct current
Magnitude of voltage : Low
Type of current : alternating current
Magnitude of voltage : High
Type of current : Alternating current
Magnitude of voltage : Low
Type of current: direct current
Diagram shows a National Grid Network to transmit electricity. The energy dissipated during the transmission can be reduced by
Using high resistivity cable
Using high current
Using low density cable
Using high voltage
