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WorksheetsElectricity and Magnetism
Total questions: 60
Worksheet time: 31mins
geothermal
solar
wind
Which energy source is used in the following power plant?
Nuclear power
Tidal power
Geothermal power
Hydroelectric power
Which energy source is used in the following power plant?
Nuclear power
Tidal power
Solar power
Hydroelectric power
Which part in a power station produces electrical energy?
Turbine
Boiler
Generator
Transformer
In a thermal power station, where is steam produced?
Furnace
Boiler
Turbine
Transformer
What type of power station
Thermal power station
Biomass power station
Hydroelectric power station
Solar power station
What type of power station
Thermal power station
Wind power station
Hydroelectric power station
Solar power station
The electricity in our house is
AC
DC
BC
AD
An electric current flowing in one direction only
voltage
parallel current
direct current
electric current
Electric currents passing through wires will produce a(n)
solenoid
magnet
magnetic field
insulator
If a transformer reduces voltage, it is called a....................... transformer.
step left
step right
step up
step down
The winding of wire around a core which is connected to a source of energy is called the ....... coil.
primary
secondary
tertiary
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
Which of the following is an example of appliance using alternating power source?
What is the material used for construction of transformer core?
Aluminium
Copper
Iron
Wood
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
Ratio of voltages is equal to ratio of _______________________.
number of iron sheets in core
number of coil
number of turns in coil
number of electromagnetic
The function of a transformer is to ...
raise and lower the apparent power levels
transfer DC voltage from the primary winding to the secondary winding
increase or decrease A.C voltage or A.C current levels
transform mechanical energy into electrical energy
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.
Electricity is generated at a .......
power station
petrol station
power source
source of energy
Electricity is sent over ............... transmission lines.
low voltage
no voltage
high voltage
Function of the national grid network.
Transmit high voltage alternating current.
Switch off the alternating current.
Step down the voltage of alternating current.
Advantages of National Grid Network.
(More than one answer)
reduce cost, a large quantity of electrical energy can be supplied by two or more power stations.
prevent black out, power station under maintenance can be taken over by another power station.
Transmit low voltage of alternating current to reduce cost.
High votage is used to ____ ____ _____ in the form of heat during long distance transmission.
(a)
The flowchart shows the sequence of the components in the electricity transmission and distribution system.
Power station -----> _____________ -----> National Grid Network ----> Main substation ----> _____________ ----> _____________ ----> Branch substation ----> Step-down transformer
Switch zone, step-up transformer, step-down transformer
Switch zone, step-down transformer, step-up transformer
Step-up transformer, step-down transformer, switch zone
Step-up transformer, switch zone, step-down transformer
The voltage of the alternating current is highest at the
power station
National Grid Network
branch substation
2-pin plugs are not connected to the earth wire.
TRUE
FALSE
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
P, Q, R, S
R, Q, S, P
R, Q, P, S
_______ carries electric current to an electrical appliances.
Neutral wire
Live wire
Earth wire
_______ returns electric current to the branch substation.
Neutral wire
Live wire
Earth wire
___________ disconnects the current supply temporarily when it is not needed (such as during repairing damaged wiring).
ELCB circuit breaker
MCB circuit breaker
Main switch
Electric meter
___________ cuts off the current supply in the house when excessive current flows through it.
ELCB circuit breaker
MCB circuit breaker
Main switch
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
MCB circuit breaker
Main switch
Electric meter
What is the colour of earth wire?
Brown
Red
Yellow and green stripes
Blue
The main supply of electrical energy in a house has a voltage of
33 kV
415 V
240 V
If an electrical appliance uses current of 11 A, which is the suitable value of fuse to be used.
15 A
5 A
10 A
13 A
Choose the safety components found in wiring system at home.
Lightning conductor
ELCB circuit breker
MCB circuit breaker
Electric meter
Main switch
If the earth wire is damaged...
The user will suffer from electric shock
The appliance won't work
The appliance will overheat
TV is 240V and 800W. What is the suitable fuse rating for the TV?
1 A
2 A
3 A
5 A
Heater is 240V and 2200W. What is the suitable fuse rating for the heater?
10 A
13 A
3 A
5 A
The primary function of a fuse is to
Open the circuit
Protect the appliance
Protect the line
Prevent excessive currents from flow through the circuit
A space heater plugged into a 120 V outlet carries a current of 12.5 amps. The heater is run for 4 hours. How much energy is used by this heater?
6000 kWh
6 kWh
38.4 kWh
2.4 kWh
The meter reading at a home on the first of May is 46831. The meter reading at the same home on the first of June is 48423. How much did the monthly energy cost if the price per kWh is 0.07263.
$1592.00
$159.20
$115.63
$3.40
How much does it cost to operate a TV for a month if the TV uses 110 V in a 0.33 amp circuit and is operated for 6 hours a day. The cost per kWH is $0.08112
$530.04
$4.87
$0.02
$0.53
If you have 26 light bulbs in your home, each 60 watts, how much does it cost to operate them, on average, for 2.5 hours a day, for a month? The cost of electrical energy from the utility company is $0.100496.
$391.93
$11,578.03
$15.07
$11.75
What type of by-products does nuclear energy produce? (a disadvantage)
carbon dioxide
radioactive waste
sulfur dioxide
nitrogen oxide
Which would be the most environmentally friendly way to supplement electricity?
solar panels on a roof
hydroelectric power from a pond
a nuclear power plant
using a diesel powered generator
Which statement is true about the advantages and disadvantages of using different types of energy sources?
wind power is an expensive, nonrenewable energy source
solar power is a clean, renewable source of energy, but quite expensive
nuclear power is very cost effective, nonrenewable, and leaves behind no radioactive waste
coal is a safe and effective, renewable energy source
___________ measures the electrical energy that is used in the house.
ELCB circuit breaker
MCB circuit breaker
Main switch
Electric meter
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
