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WorksheetsIGCSE Physics Mains Electricity
Total questions: 25
Worksheet time: 16mins
measure of power
volt
ohm
watt
amp
Which wire is connected to a fuse in a plug?
Live
Neutral
Earth
Positive
Which one is a Fuse?
What is another Equation for Power?
Power = Current / Potential Difference
Power = Potential Difference / Current
Power = Current x Potential Difference
What are the Equations for Energy Transferred? Choose 2
Energy Transferred = Power x Time
Energy Transferred = Power / Time
Energy Transferred = Charge Flow x Potential Difference
Energy Transferred = Charge Flow / Potential Difference
What advantage does a circuit-breaker have over a fuse in an electric circuit?
A circuit-breaker provides an alternate route for the current to flow
A circuit-breaker can be reset
A fuse can be reset
A fuse is more expensive
An appliance works at 3A. What is the best option for a fuse in the circuit connected to this appliance and why?
5A, so that the fuse does not blow when the appliance is used normally
7A, since it allows a current much larger than needed for the appliance to flow in the circuit
2A, so that the fuse blows when the appliance is used normally
3A, since the fuse blows at the same value of current that the appliance needs
What is the difference between a.c. and d.c?
d.c. is always a bigger current than a.c.
a.c. is always a bigger current than d.c.
a.c. remans constant in direction of current flow whereas d.c. oscillates in direction of current flow
a.c. oscillates in direction of current flow whereas d.c. remains constant in direction of current flow
There is no difference
A toaster has a power of 1800 W while operating at a voltage of 230 V. Show that the current in the toaster is about 8 A.
1800 / 230 = 7.826...
1800 / 230 = 7.827...
230 / 1800 = 8
230 / 1800 = 7.826...
Explain the meaning of the term "earthed".
A wire that has a direct connection to the earth
A wire that is directly covered with earth
A wire made of earth
An insulated wire that is buried in the earth
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.
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.
X Z Y
Y X Z
Z Y X
Y Z X
What material are the pins made from in a UK plug?
Aluminium
Copper
Iron
Brass
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
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
The current in a motor is 2.1 A and the potential difference across it is 12V. The motor takes 1.5 seconds to lift a mass. What is the energy transferred to the motor as it lifts the mass?
85 J
3.8 J
38 J
8.5 J
The following three appliances are connected to a 120-V house circuit: i) toaster, 1 200 W, ii) coffee pot, 750 W, and iii) microwave, 800 W. If all were operated at the same time, what total current would they draw?
3.0 A
5.0 A
10 A
23 A
How much energy is transferred if a 40W bulb is left on for 2 hours?
80 J
4800 J
240 J
288 000J
Which fuse is most suitable for a 2kW electric fire which is connected to a 230V power supply?
3A
5A
10A
13A
