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WorksheetsSources of Electricity
Total questions: 15
Worksheet time: 8mins
Which material is used as the core in both step-up and step-down transformers?
carbon
cobalt
iron
steel
Which type of transformer are used in these examples?
A
B
C
D
The transformer shown has two coils of wire wrapped around a metal core.
Which statement about the transformer is correct?
The core is made from copper.
The current in both coils is the same.
The input and output voltages are different.
The transformer will work from a DC supply.
Which diagram shows the structure of a transformer?
A
B
C
D
Which row correctly describes the roles of different parts of the system that provides electrical energy to homes?
A
B
C
D
What can cause a very large current in a household wiring system?
circuit breaker
connecting too many appliances to one socket
poor or loose connections
the wrong fuse rating
What is the function of a transformer?
to change the current of an alternating current supply
to change the voltage of an alternating current supply
to reduce the power loss in cables
to reverse the direction of current
Which of the following is a cause of electrical hazards?
circuit breaker
damp conditions
earth wire
fuse
What is the reason for electrical energy to be transmitted at high voltage from the power station to the houses?
to allow the use of cheaper cables
to have a higher current flowing in the transmission cables
to reduce energy loss
to reduce the chances of the cables catching fire
The diagram below shows a transformer. What are the possible values for the input and output voltage?
A
B
C
D
The diagram below shows a wire and a 3-pin socket.
Why is it dangerous to continue using it?
The fuse may have melted.
The wire does not contain an earth wire
The insulation is frayed and the wire is exposed
The appliance does not have a double insulation
What is the type of electrical hazard shown?
damp condition
exposed wires
loose connections
overloading
The diagram shows the transmission of electricity.
Which type of transformers should be used in Substation A and Substation B ?
A: step-up, B: step-up
A: step-up, B: step-down
A: step-down, B: step-up
A: step-down, B: step-down
The diagram shows a fossil fuel power station.
What is the energy conversion involved when steam from the boiler is used to turn the turbine?
chemical potential energy to electrical energy
chemical potential energy to thermal energy
thermal energy to electrical energy
thermal energy to kinetic energy
For safety purposes, a wire is connected to the metal casing of electric kettles. Why is this done?
To allow an electric current to flow through the kettle in order for it to work.
To prevent a person from getting an electric shock if there is a faulty live wire touching the metal casing.
To prevent the metal casing from becoming too hot to touch.
To switch off the kettle automatically if all the water evaporates when heated.
