SP10g Power | Edexcel GCSE Physics Topic Mastery Pack

A focused three-component revision and exam practice pack for SP10g, covering the complete Edexcel Separate Science Physics specification for the three electrical power equations and their applications (P10.28–P10.31).

Topic Mastery Sheet covers all three power equations - P = E/t, P = I × V, and P = I² × R - with worked examples for each; the definition of the watt (1 W = 1 J/s); a table of typical power ratings for common appliances; and a detailed worked example of the “show that” kettle question (1200 W, 11.5 Ω) that appears in the Higher exam, walking through the rearrangement of P = I²R to find I, explicitly explaining why the answer must be stated as 10.2 A rather than 10 A. The distinction between power and energy (a higher-power appliance is faster, not necessarily more energy-efficient) is developed using the example of kettles.

Student Exam Practice Sheet includes a P = IV equation recall and rearrangement; a three-mark current calculation for a 24 W, 6 V torch; a P = I²R equation recall; the 1200 W / 11.5 Ω “show that” question requiring full working; and a three-mark P = E/t calculation with unit conversions. Question format matches the Edexcel Higher test style.

Teacher Answer Key provides a complete mark scheme with a specific note that for the “show that” question, working must be shown and the answer “10 A” or “10.0 A” is not accepted - the full working leading to 10.2 A is required.

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