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WorksheetsMains Electricity
Total questions: 61
Worksheet time: 3615secs
Which of the following best explains an electric current?
An electric current is the flow of positive charges in a circuit.
An electric current is the flow of atoms in a circuit.
An electric current is the flow of electrons in a circuit.
An electric current is the flow of neutrons in a circuit.
Which of the following statements is correct about electrical insulators?
They do not contain any atoms.
Their protons are not allowed to move about freely.
The electrons are not able to move about freely.
They are good at conducting heat only.
Which of the following substances is the best conductor of electricity?
Glass
Wood
Water
Mercury
Which of the following is the SI unit for electric current?
Ohm
Watt
Ampere
Volt
An electric kettle is commonly used to heat up water at home. The heating element used is nichrome wire and not copper. Which of the following reasons best explains why nichrome is used instead of copper?
Nichrome conducts more current than copper, so more heat can be generated.
Nichrome has higher resistance than copper, so more heat can be generated.
Nichrome has higher voltage than copper, so more heat can be generated.
Nichrome are cheaper than copper, so it is more economical.
Which of the following materials is used in a light bulb to produce heat and light?
Nichrome
Copper
Tungsten
Steel
Which of the following electrical appliances does not make use of a variable resistor?
Volume controls in radio
Dimmers in cinemas
Speed control of a toy car
Electric kettle
A higher resistance in a circuit causes a _____________.
higher voltage
larger current
smaller current
lower voltage
Which of the following is not a source of electrical energy?
ammeter
dry cell
mains
dynamo
The instrument that measures electric current is called ___________.
a resistor
a voltmeter
an ammeter
an electrometer
Identify all conductor(s) in below
clothes
sulphuric acid
gold ring
graphite
Identify all insulator(s) below.
Tick if the following unit(s) is correct.
Current: Volts (V)
Voltage: Amperes (A)
Resistance: Ohms (Ω)
If lamp 1 is unscrewed from its holder, what will happen to lamp 2?
It will get brighter
It will get dimmer
It will turn off
Nothing
What is wrong with this circuit diagram?
There is only one cell
The ammeter should be connected in series
A ammeter should be connected in parallel
If one of the light bulbs burns out,
no electricity flow through the other bulbs
other bulbs can still light up
other bulbs will go out
other bulbs also burn out
Which of the following describes the circuit correctly?
A circuit with a cell, two bulbs connected in parallel with an open switch
A circuit with a cell, two bulbs connected in series and an open switch
A circuit with a cell, two bulbs connected in series
A circuit with a cell, two bulbs connected in series and a closed switch
yellow and green blue brown
brown blue yellow and green
yellow and green brown blue
blue brown yellow and green
neutral live earth
earth neutral live
live earth neutral
live neutral earth
Its voltage alternates between 220 V and 0 V periodically.
It is blue in colour.
A fuse is fitted in it.
The current flows through it in one direction only.
Its voltage is always 0 V.
It is green in colour.
A fuse is fitted in it.
No current flows through it.
It is a safety wire.
It is yellow and green in colour.
It is connected to the metal body of an electrical appliance.
An alternating current flows through it under normal conditions.
All the holes are normally closed with shutters.
The neutral hole is connected to the earth hole directly.
The live hole is fitted with a fuse.
The earth wire is connected first when a three-pin plug is plugged into the socket.
Keep appliances in stand-by mode when not in use at night.
Use energy-saving light bulbs instead of filament bulbs.
Maintain appliances properly for optimum performance.
Turn the light off when nobody is in the room.
X Z Y
Y X Z
Z Y X
Y Z X
A circuit breaker can cut off a current if it is too large.
A circuit breaker can be reset easily.
A circuit breaker is cheaper.
A circuit breaker is more commonly seen.
(1) only
(2) only
(1) and (2) only
(2) and (3) only
(1) and (2) only
(1) and (3) only
(2) and (3) only
(1), (2) and (3)
(1) and (2) only
(1) and (3) only
(2) and (3) only
(1), (2) and (3)
Which wire is connected to a fuse in a UK plug?
Live
Neutral
Earth
Positive
What material are the pins made from in a UK plug?
Aluminium
Copper
Iron
Brass
Tranformers are used in the National Grid to...
increase or decrease the current
increases or decrease the potential difference
convert the energy to electrical energy
speed up the electrons in the circuit
Alternating current is used because...
it can be easily changed and therefore is suitable for long distance travel
it remains constant and is therefore suitable for long distance travel
it uses less energy than direct current and therefore less overall energy is used
it doesn't degrade the wires and therefore they last longer
Which one is a Fuse?
Which one is a Live Wire?
Brown. Provides the alternating potential difference
Blue. Completes the circuit and carries away current
Green and Yellow. Only carries current when there is a fault
Which one is a Neutral Wire?
Brown. Provides the alternating potential difference
Blue. Completes the circuit and carries away current
Green and Yellow. Only carries current when there is a fault
Which one is an Earth Wire?
Brown. Provides the alternating potential difference
Blue. Completes the circuit and carries away current
Green and Yellow. Only carries current when there is a fault
Which does the national grid use?
High Potential Difference
High Current
Low Potential Difference
Low Current
What is the Equation for Charge Flow?
Charge Flow = Current x Time
Charge Flow = Current / Time
Charge Flow = Time / Current
This is the symbol for a...
Light Dependent Resistor
Light Emitting Diode
Thermistor
Cell
The type of current where current keeps changing direction
Direct Current
Alternating Current
Electron Flow
Voltage
What colour is the earth wire in a three pin plug
Brown
Blue
Green and yellow
What is the purpose of the earth wire in a three pin plug?
To provide a return path and complete the circuit.
To provide a return path for the current to the earth in case of electrical fault
To carry the electric current to the device
What is the purpose of the neutral wire in a three pin plug?
To provide a return path and complete the circuit.
To provide a return path for the current to the earth in case of electrical fault
To carry the electric current to the device
What is the purpose of the live wire in a three pin plug?
To provide a return path and complete the circuit.
To provide a return path for the current to the earth in case of electrical fault
To carry the electric current to the device
