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Transcript
Transformers are used to either increase or decrease the voltage in a circuit based on the number of coils at the primary and secondary coils of the electromagnet. Is the example her stepping up or stepping down the voltage? Their other use is in relays. Where do you come across relays every single day? In your house they are used in circuit breakers. When do circuit breakers shut off the electricity? When an image is seen in a planar mirror we say it is inverted and virtual. Year 11 Half Term 3 Learn Sheet Physics Key Words: Reflection: Light returning from a planar surface with the angles of incidence and reflection being equal. Refraction: The bending of light as it crosses the boundary between two materials of different densities. Diffraction: The spreading of waves as they pass through a gap. Concave Lens: A lens that causes light rays to diverge. Convex Lens: A lens that causes light rays to converge. Electromagnet: A device with an iron core and a wire coiled around it. When a current is run through the wire the core becomes magnetic. Step up Transformer: A device used to adjust the voltage. Step up transformer increase the voltage. Step down Transformer: A device used to adjust the voltage. Step down transformer decrease the voltage. In scrap yards they are used to lift things. Why are they better than permanent magnets at this? Electromagnets have some very useful everyday uses. Snell’s Law: Tells us how much a ray of light will refract at a given boundary based on the refractive indexes of the two materials. Refractive indexes are based on how dense something is. The higher its density, the higher its Refractive Index. The closer the size of the gap to the wavelength, the greater the diffraction that occurs. Questions 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. What is Snell’s law? What is a refractive index? Explain the difference between refraction and reflection Explain the difference between a concave and a convex lens Explain what diffraction is? What is an electromagnet? What are electromagnets everyday uses? Why is an electromagnet better than a permanent magnet in a scrap yard? When do circuit breakers cut off the electricity? How are electromagnets used in a relay circuit? Where do you come across relays every single day? What is a transformer? Explain the difference between a step up and a step down transformer