Master Topic P3 of OCR Gateway Combined Science A (J250): static electricity and charge, electric current and charge, potential difference and resistance, series and parallel circuits, I–V characteristics, electrical power and energy, magnets and magnetic fields, electromagnetism, and the motor effect and electric motors. Worked calculations, required-practical methods, exam tips and Mid/Stronger/Top-band model answers for the Foundation and Higher tiers. (The generator effect, dynamos and loudspeakers are separate-science only; mains and domestic electricity are covered in P6.)
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