OCR AS level Physics presentations for module 4: Energy, Power, and Resistance. All presentations come with worked examples, solutions and homeworks. This covers topics from Kirchhoff’s laws to potential dividers and sensing circuits.

Resources for P5 GCSE OCR Physics Gateway 9-1 Triple and Combined (Higher and Foundation) is covered in this material. Each lesson includes student activities and full worked answers. Definition of a wave Mechanical waves Electromagnetic waves Transverse waves Longitudinal waves Amplitude Wavelength Frequency Time period Calculating frequency and equation Relationship between frequency and wavelength when speed is constant. Calculating time period from frequency with equations The speed equation Measuring distance and time Simple experiment for the speed of sound Improving experiments Echoes Speed of sound experiment with microphones and oscilloscope. Ray diagrams Absorption, reflection and transmission Sonar Ultrasound Rearranging equation Refraction Relationship between wave speed and wavelength Structure of the ear. Frequency range of human hearing. Explanation of the limited frequency range of humans. Explanation for hearing deteriorating with age. Order of the electromagnetic spectrum Wavelength and frequency relationship Application of wave speed equation Rearranging equation Producing and detecting radio waves Recall that light is an electromagnetic wave Give examples of some practical uses of electromagnetic waves in the radio, micro-wave, infra-red, visible, ultraviolet, X-ray and gamma-ray regions Describe how ultra-violet waves, X-rays and gamma rays can have hazardous effects, notably on human bodily tissues. Explain that electromagnetic waves transfer energy from source to absorber to include examples from a range of electromagnetic waves Precautions for ultra-violet waves, X-rays and gamma rays Careers: Medical Physicist X-rays CT scans Gamma imaging Thermogram Magnetic Resonance Imaging Precautions for using ionising radiation Law of reflection Labeling and measuring angles of incidence and reflection Practical activity instructions - fully animated. Reflection, absorption, and refraction is affected by wavelength of electromagnetic wave. Refraction the change of velocity - speed and direction Magnitude of refraction depending on wavelength Magnitude of refraction depending on optical density Refraction practical activity instructions Wave speed, wavelength, and frequency relationship in refraction Convex and Concaves lenses Eyes and corrective lenses Refraction and wavelength Focal points for lenses Determining the type of images produced through a lens Names of colours for the visible spectrum Coloured filters Coloured objects acting as a coloured filters White light and refracting prism Refraction and wavelength Specular reflection Diffuse scattering Scattering - Why the sky is blue and milk is white.

All resources for P8.2 Powering Earth GCSE OCR Physics Gateway 9-1. Triple and combined (Higher and Foundation) is covered in this material. Types of different energy sources Renewable and non-renewable definitions Different uses of energy sources - transport, heating, and generating electricity Advantages and disadvantages of different energy sources Fossil fuels – oil, coal, and natural gas. Nuclear fuel – Uranium Biofuels – wood, biodiesel, and biogas. The sun - solar (PV) panels and solar heating panels Tides Waves Hydroelectricity Wind Geothermal How use of energy resources have changed over time. (Biofuels, Fossil Fuels, Nuclear, Renewable). How energy use has increased (increase population and development of technology) Explain patterns and trends in the use of energy resources. Fossil fuels are finite and will run out at current consumption levels. Structure of the National Grid Step-up and Step-down transformers How transformers increase the efficiency of the National Grid Number of turns and potential difference Current and potential difference in primary and secondary coils Domestic Electrical Supply being 230 V, AC at 50 Hz. Direct potential difference and alternating potential difference. Reasons for insulation on wires. Potential Difference between different conductors. Function of the earth conductor. Double insulation and no earth wire. Reasons the live wire is dangerous. Reasons why live to earth is dangerous.