A focused three-component revision and exam practice pack for SP10e, covering the complete Edexcel Separate Science Physics specification for I–V characteristics of filament lamps, diodes and fixed resistors, and resistance variation in LDRs and thermistors (P10.18–P10.21).

Topic Mastery Sheet covers the I–V graph shape for each of the three required components (fixed resistor: straight line through origin; filament lamp: S-curve flattening at high voltage; diode: flat at zero then steep rise at forward threshold voltage), with an explanation of why each shape occurs; the key properties of NTC thermistors and LDRs presented in a table with applications; and a detailed explanation of why filament lamp resistance increases with temperature using the electron-ion collision model, as this is the three-mark explanation question that appears in the Higher paper. The most common error - confusing the direction of thermistor and LDR resistance change - is addressed directly.

Student Exam Practice Sheet includes a thermistor graph MCQ; a diode I–V sketch question with labelled axes; a three-mark filament lamp explanation; a one-mark LDR resistance description; and a two-mark application question. Question format matches the Edexcel Higher test style.

Teacher Answer Key provides a complete mark scheme specifying that “atoms” is accepted for “ions” in the filament lamp explanation, that the diode graph requires both the flat zero-current region and the steep forward-bias rise for both marks, and that application answers must include both the named application and an explanation of how the changing resistance is useful.

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