P5 - Mains electricity

Independent Learning

Introduction

We all use electricity in our everyday lives. In this unit we look at why the mains supply uses alternating current and how we can use the electricity formulas to work out which fuse we need and how much energy will be transferred.

Specification links


Task 1: Know

Task 1a: Use look cover write check and quizlet to learn the keywords and ideas for this topic.

P5 Knowledge Organiser.pptx

Task 1b: Listen to the podcast for an overview of the topic

Learn

Task 2: Alternating current and transformers

Task 2a: Watch the video and read through the slides

Lesson 1 Alternating Current -Default

Task 2b: Make notes that include

  • Describe the differences between direct and alternating current.

  • Give the frequency and potential difference of the UK mains supply

  • Set 1&2: Describe rectification

  • Describe the national grid.

  • Explain why the National Grid uses very high potential differences.

  • Describe the role of transformers in the National Grid

  • Set 1&2: Give the transformer equation

  • Set 1&2: Complete the calculations on slides 31 and 33, and check your answers using slides 32 and 34.

Task 2c: Complete and self mark the exam questions

Task 3: Cables and plugs

Safety note: Do not attempt to wire a plug unless:

  1. You are completely certain it is isolated from the mains power supply

  2. You are supervised by a 'competent adult'

Task 3a: Watch the video and read through the slides

Lesson 2 - Cables and plugs -Default

Task 3b: Make notes that:

  • Explain the function of each part of a plug

  • Identify and explain the materials used in cables and plugs in terms of their physical and electrical properties

  • Describe why a short circuit inside a device presents a hazard

Task 3c: Copy and complete the table below

Task 3d: Complete and self mark the exam questions

Task 4: Power and potential difference

Task 4a: Read through the slides and complete the calculation tasks

Lesson 3 - Electrical Power - Default

Task 4b: Make notes that

  • Define power

  • List formulae for calculating power

  • Explain how to calculate fuse requirements



Task 4c: Complete and self mark the exam questions

Task 4d: Complete the progress check quiz

Task 5: Current and energy transfer

Task 5a: Watch the videos then read through the slides completing the calculations as you go.

Lesson 4 - Electric currents and energy transfer - default

Task 5b: Make notes that:

  • Give the equation linking energy transferred, charge and time.

  • Describe the energy changes taking place in circuit components and explain how they occur

  • Explain how to calculate the energy changes taking place in electric circuits

Task 5c: Complete and self mark the exam questions

Task 6: Appliances and efficiency

Task 6a: Read through the slides and complete the calculations as you go through

Lesson 5 - Appliances & Efficiency - Default

Task 6b: Make notes that:

  • List 5 energy transfer pathways

  • Give 3 formulas for calculating power

  • Define efficiency

  • Give 2 formulas for calculating efficiency

Task 6c: Complete and mark the exam questions

Task 7: Summary

Task 7a: Read the BBC Bitesize summary and complete the quiz

Task 7b: Complete the Seneca learning for this topic:

Task 7c: Make and mind map or other revision summary for this topic and add it to you revision folder. Use the specification to help you:

Specification links

Task 8: Check

Complete the quiz to make sure you understand this topic