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WorksheetsDomestic electricity
Total questions: 10
Worksheet time: 20mins
What are 2 differences between the electricity supply from the mains and the supply from a battery? Tick 2 boxes.
A battery has a higher potential difference than the mains.
The current from the mains is alternating current whereas a battery supplies direct current.
The current coming out of the mains is always higher than a battery.
The mains has a greater voltage than a battery.
What is the frequency of the mains?
230V
130V
50Hz
230Hz
In the order shown in the picture from left to right what are the names of the different coloured wires?
earth, neutral, live
neutral, earth, live
earth, live, neutral
live, earth, neutral
What is the potential difference of the live wire?
230V
50V
12V
0V
What is the potential difference of the neutral wire?
230V
50V
12V
0V
Which statement best describes a fuse?
A device that controls the current running through an appliance.
An adaptor that transforms the voltage in the circuit into current.
A safety feature where a piece of wire of a specific thickness melts when the current is too high breaking the circuit.
A safety feature where a piece of wire of a specific thickness melts when the voltage is too high breaking the circuit.
What advantages do circuit breakers have over fuses? Tick 2 boxes.
They are triggered faster.
They are less expensive to buy.
They use up less electricity.
They do not need to be replaced each time they are triggered.
Which scenario most necessitates the earth wire?
An appliance with a plastic case.
An appliance with a metal case.
An appliance with a 12V power supply.
In a plug, which wire is the fuse wire connected to?
The live wire
The neural wire
The earth wire
None of the above
The resistance of an appliance is 50 ohms. It is plugged into the mains. Using the formula V=IR determine what fuse should be connected to the appliance.
3A
5A
7A
13A
