Three cores plugs

• What is the primary purpose of cables in electrical systems?

  To carry electrical currents from plug sockets to appliances
• What type of current do plug sockets supply?

  Alternating current from the mains or National Grid
• Why do we wrap cables with insulating plastic?

  To prevent electrocution when handling the cables
• What are the three wires contained inside a cable and their color coding?

  • Brown wire: Live Wire
  • Blue wire: Neutral Wire
  • Green and yellow striped wire: Earth Wire
• What is the function of the Live Wire?

  It carries an alternating potential difference from the supply
• What does the Neutral Wire do in a circuit?

  It completes the circuit to the appliance
• What happens to the current in the Live and Neutral wires?

  The current in both wires constantly changes direction
• How do the wires in a cable relate to a plug?

  Each wire corresponds to a prong in the plug
• Where is the Neutral Wire located in a British plug?

  On the left side
• Where is the Live Wire located in a British plug?

  On the right side
• What is the purpose of a fuse in a plug?

  To break the circuit when the current becomes too large
• How does a fuse work?

  It contains a thin wire that melts at high currents
• What does the circuit symbol for a fuse look like?

  A resistor with a line through it
• What are the key features of the Launchpad learning platform?

  • Covers the whole specification
  • Interactive quizzes
  • Easy to follow videos
  • AI tutor support
• What is the function of the Earth Wire?

  To provide a safety path for electrical faults
• Why do some plugs only have two prongs?

  Because their Earth wires connect to a separate conductor on their casing
• How does the arrangement of wires in a plug ensure safety?

  By ensuring the Live Wire passes through a fuse before reaching its prong
• What is the relationship between the Live Wire and the Neutral Wire in terms of potential difference?

  • Live Wire: High alternating potential difference
  • Neutral Wire: Much lower potential difference