P3, Hydraulics and Transformers 0.0 / 5 ? PhysicsTransformersGCSEAQA Created by: emmajane_Created on: 18-05-14 17:55 What happens if an electrical conductor 'cuts' through a magnetic field? A potential difference is induced across the ends of the conductor 1 of 13 What happens if a magnet is moved into a coil of wire? What is this the basic structure of? A potential difference is induced across the ends of the coil- Basic structure of a stansformer 2 of 13 What does an alternating current in the primary coil produce in the iron core? A changing magnetic field in the iron core and hence in the secondary coil 3 of 13 What is the potential difference like in a step-up transformer? More potentail difference across the secondary coil than across the primary coil 4 of 13 What is the potential difference like in a step-down transformer? Potential difference is less across the secondary coil than the primary coil 5 of 13 If a transformer is 100% efficiant, what will electrical power output equal to? The electrical power input 6 of 13 What type of frequency does a switch mode transformer work at? A high frequency between 50kHz and 200kHz. 7 of 13 What are switch mode transformers often used for and why? Used for things such as phone chargers because they are lighter and smaller than traditional transformers 8 of 13 What is the kHz of a mains supply? 50 kHz 9 of 13 How much power do switch mode transformers used when turned on? Very little but no load is applied 10 of 13 What enables systems to be used as a force multiplyer? The use of different cross-sectional areas on the effort and load side of a hydraulic system 11 of 13 What happens if force is exerted on to one point of a liquid? liquid will be transported to another point of the liquid 12 of 13 What is pressure like on a liquid, and how can liquid be described? Pressure in a liquid is transmitted equally in all directions. Liquid can be described as virtually incompressible 13 of 13
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