Objectives

Lesson outcomes

  • Define efficiency as the ratio of useful output to total input and use it in calculations.
  • Define power as the rate of doing work or transferring energy.
  • Use P = W/t to solve power problems.
  • Derive and use P = Fv for motion at constant speed.
Syllabus

CIE 9702 syllabus points

5 linked

Lesson Notes

Teacher and student guidance

Overview

Relate power to the rate of transfer and efficiency to useful output. Use this page to organise your notes, worked examples, and linked resources.

Key knowledge and explanations

  • Main idea: Relate power to the rate of transfer and efficiency to useful output.
  • Key definitions, models, equations, or diagrams to introduce.
  • One worked example, demonstration, or observation that makes the idea concrete.

Lesson flow

  1. Start with prior knowledge, context, or a short recall task.
  2. Work through the main explanation, method, diagram, or calculation for this lesson.
  3. Complete guided practice, discussion, calculations, or practical application.
  4. Review the learning with an exit prompt, short question, or summary task.

Checks for understanding

  • Use a hinge question aligned to the main objective(s) to check your understanding.
  • Use a short verbal, written, or numerical response to check for secure understanding.

Common mistakes or misconceptions

  • Watch for the likely misconception, error, or weak step in this lesson.
  • Review the comparison, model answer, or explanation that will correct it.

Follow-up

  • Complete the homework, retrieval task, or resource revisit linked to this lesson.
  • Note what you need to carry forward into the next lesson.
Lesson Resources

Materials for this lesson

Embed videos, slide decks, documents, or direct links in the frontmatter for each lesson.

Worksheet

Power and Efficiency – Questions 3

Power and Efficiency – Questions 3

Open resource
Practical

Efficiency Practical

Efficiency Practical - Using an electric motor to raise a load

Open resource
Worksheet

Power and Efficiency - MCQs

Power and Efficiency - MCQs

Open resource