OCR Gateway GCSE Combined Science A Physics: electricity, waves and radiation (P3 to P4) overview
An overview of the electricity and magnetism and waves and radioactivity content (topics P3 and P4) in OCR Gateway GCSE Combined Science A (J250), mapping circuits, electromagnetism, wave properties, the electromagnetic spectrum, radioactivity and half-life, and how they are examined.
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These physics topics of OCR Gateway GCSE Combined Science A (specification J250) cover electricity and magnetism, and waves and radioactivity. P3 Electricity and magnetism and P4 Waves and radioactivity are examined across Physics Paper 5 (P3) and Physics Paper 6 (P4). This page maps the topics and links to a focused answer page for each.
The electricity, waves and radiation topics
- Electric circuits (P3)
- Circuit symbols, current as the flow of charge, potential difference and resistance, the equation linking them, the I-V characteristics of components, and series and parallel circuits. See Electric circuits.
- Electromagnetism (P3)
- Permanent and induced magnets, magnetic fields, the field around a wire and a solenoid, electromagnets and their uses, and the motor effect. See Electromagnetism.
- Wave properties (P4)
- Transverse and longitudinal waves, amplitude, wavelength, frequency and period, the wave speed equation, and reflection and refraction. See Wave properties.
- The electromagnetic spectrum (P4)
- The spectrum as a continuous range of transverse waves, the order from radio waves to gamma rays, the uses of each region, and the dangers of the higher-energy waves. See The electromagnetic spectrum.
- Radioactivity (P4)
- Atomic structure and isotopes, radioactive decay as a random process, the nature and properties of alpha, beta and gamma radiation, and nuclear equations. See Radioactivity.
- Half-life and applications (P4)
- The definition of half-life and how to calculate remaining activity, the uses of radioactive sources, irradiation versus contamination, and reducing the risks of radiation. See Half-life and applications.
How these topics are examined
Topic P3 is assessed on Physics Paper 5, and topic P4 on Physics Paper 6; each paper is 1 hour 10 minutes, worth 60 marks and one sixth of the overall grade. Questions include circuit and wave calculations, graph and spectrum recall, nuclear equations and half-life calculations, and six-mark extended responses. Every paper also tests CS7 practical skills, so practicals such as investigating resistance, the I-V characteristics of components, and waves can be examined.
How to study the electricity, waves and radiation topics
- Work from the specification statements. Each point is a checklist; questions are written from them.
- Master the circuit and wave equations. Potential difference, current and resistance, and wave speed, must be automatic to rearrange.
- Learn the series and parallel rules. Knowing what stays constant and what shares in each is worth many marks.
- Memorise the electromagnetic spectrum. Learn the order, the uses and the dangers of each region.
- Drill half-life and the three radiations. Penetrating power, nuclear equations and half-life calculations recur in every Paper 6.
For the official specification
OCR publishes the full specification, past papers and mark schemes at ocr.org.uk. Always revise from the current specification and OCR's own past papers, because question style is board-specific.