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Questions and Answers
In a plug there are 3 wires - ​ Live wire: Brown, at 230V, Carries the alternating potential difference from the supply, This may be dangerous even if mains circuit is off, as current may still be flowing through it ​ Neutral Wire: Blue, at 0V, Completes the ______
circuit
Earth wire: Green and Yellow stripes, at 0V. It only carries a ______ if there is a fault. It's a safety wire to stop the appliance becoming live. It is connected to the earth and to the casing.
current
If the live wire touches the metal casing of the appliance, it will become ______ (you’ll get a serious electric shock if you touch it, as current flows through you to the ground)
live
Live wire: Brown, at 230V, Carries the alternating potential difference from the supply, This may be dangerous even if mains circuit is off, as ______ may still be flowing through it
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Earth wire: Green and Yellow stripes, at 0V. It's a safety wire to stop the appliance becoming ______. It is connected to the earth and to the casing.
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Study Notes
Electrical Wires in a Plug
- Brown wire, also known as the live wire, carries an alternating potential difference of 230V from the supply and can be dangerous even when the mains circuit is off, as current may still be flowing through it.
Wire Functions
- Blue wire, also known as the neutral wire, completes the circuit and is at 0V.
Safety Wire
- Green and yellow striped wire, also known as the earth wire, carries a current only in the event of a fault and is a safety wire that prevents the appliance from becoming live.
- The earth wire is connected to the earth and the casing of the appliance.
- If the live wire touches the metal casing of the appliance, it will become live, and if you touch it, you'll get a serious electric shock as current flows through you to the ground.
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Description
Learn about the functions and dangers associated with the 3 wires in an electrical plug: Live wire, Neutral wire, and Earth wire. Understand the roles of each wire in completing the circuit, carrying potential difference, and ensuring safety.
