Lesson Plan: P1.3.05


LESSON PLAN
Teacher Subject Period Date Year Ability LSA/Other Support
Science

Context and
Landmark
Assessment		 P1.3.05
Landmark Assessment: Progress Observation Opportunity
Remember to have high expectations
Lesson Title: Today we are learning about
Why do UK plugs have 3-pins?
Remember to check for PROGRESS
Focus on Knowledge, Skills and Understanding
Success Criteria: You will show your learning by...
  1. Mains electricity is an ac supply.
  2. In the United Kingdom the domestic electricity supply has a frequency of 50 Hz.
  3. [In the United Kingdom the domestic electricity supply] is about 230 V.
  4. Students should be able to explain the difference between direct and alternating potential difference.
  5. Most electrical appliances are connected to the mains using three-core cable.
  6. The insulation covering each wire is colour coded for easy identification: live wire ? brown neutral wire ? blue earth wire ? green and yellow stripes.
  7. The live wire carries the alternating potential difference from the supply.
  8. The neutral wire completes the circuit.
  9. The potential difference between the live wire and earth (0 V) is about 230 V.
  10. The neutral wire is at, or close to, earth potential (0 V).
  11. The earth wire is at 0 V, it only carries a current if there is a fault.
  12. Students should be able to explain that a live wire may be dangerous even when a switch in the mains circuit is open
  13. Students should be able to explain the dangers of providing any connection between the live wire and earth.
  14. The earth wire is a safety wire to stop the appliance becoming live.
Think about how you can match the needs of ALL students
Keywords:
  • Domestic: For use in the home rather than in an industrial or office environment. (1)
  • Direct current: an electric current flowing in one direction only. (1)
  • Alternating current: An electric current that reverses its direction many times a second at regular intervals (1)
  • Mains electricity: the form of electrical power that is delivered to homes and businesses. (1)
Links: Literacy, Numeracy, SMSC, British values
Memory Anchor:

AFL/Key Questions:
  1. What type of supply is mains electricity?
    Mains electricity is an ac supply.
  2. What is the frequency of the domestic electricity supply in the United Kingdom?
    In the United Kingdom the domestic electricity supply has a frequency of 50 Hz.
  3. What is the potential difference of the domestic electricity supply in the United Kingdom?
    In the United Kingdom the domestic electricity supply is about 230 V.
  4. What is the difference between direct and alternating potential difference?
    In direct current (DC), the electric charge (current) only flows in one direction. Electric charge in alternating current (AC), on the other hand, changes direction periodically. The voltage in AC circuits also periodically reverses because the current changes direction.
  5. How many core cables do most electrical appliances use to the mains?
    Most electrical appliances are connected to the mains using three-core cable.
  6. Why is the insulation covering of each wire in a plug colour coded? What colour is the a) Live wire b) Neutral wire c) Earth wire
    The insulation covering each wire is colour coded for easy identification: a) Live wire = Brown b) Neutral wire = Blue c) Earth wire = Green and yellow stripes.
  7. What is carried by the live wire from the supply?
    The live wire carries the alternating potential difference from the supply.
  8. What completes the circuit in a plug?
    The neutral wire completes the circuit.
  9. What is the potential difference between live wire and earth wire?
    The potential difference between the live wire and earth (0 V) is about 230 V.
  10. Which wire in a plug is at, or close to, earth potential (0 V)?
    The neutral wire is at, or close to, earth potential (0 V).
  11. What is the potential difference of the earth wire in a plug, and when would it carry a current?
    The earth wire is at 0 V, it only carries a current if there is a fault.
  12. When might a live wire still be dangerous when considering a switch?
    A live wire may be dangerous even when a switch in the mains circuit is open.
  13. What are the dangers of providing any connection between the live wire and earth?
    You would get an electric shock if the live wire inside an appliance, such as a cooker, came loose and touched the metal casing. However, the earth terminal is connected to the metal casing so that the current goes through the earth wire instead of causing an electric shock. A strong current surges through the earth wire because it has a very low resistance. This breaks the fuse and disconnects the appliance.
  14. What is the purpose of the earth wire?
    The earth wire is a safety wire to stop the appliance becoming live.
Identify questions for high, middle, low and identify questioning techniques- Challenge questions

Learning Phases/Episodes
Think about how you can match the needs of ALL students
Differentiation: AGT, SEND, LLL, Disadvantaged
Remember to check for PROGRESS
Starter Activity Differentiation and Challenge question/task
  • Students to copy and complete the keywords.
  • Teacher reveals missing letters; Students correct mistakes;
  • Discuss the scientific meanings of the words.
  • Students to write down the definitions of the most important / new keywords.
  • Discuss the 'Memory Anchor'.
    • What does it show?
    • How does it relate to the what we are learning about today (title)?
Think about PACE – Develop, consolidate and deepen knowledge, skills and understanding
Teacher or Student lead? Differentiation and Challenge question/task
Progress Check Extension
Remember to give time to apply knowledge, skills and understanding
Teacher or Student lead? Differentiation and Challenge question/task
Progress Check Extension

Teacher or Student lead? Differentiation and Challenge question/task
Progress Check Extension

Teacher or Student lead? Differentiation and Challenge question/task
Progress Check Extension


Plenary Differentiation and Challenge question/task
  • Students to answer the 'Key Questions' with learning partners.
Progress Check
  • Teacher to reveal and discuss the answers to the questions.
 Extension
  • What have learnt about the 'Big Ideas' today?

Homework Differentiation and Challenge question/task