The switch mode transformer how it works gcse physics. Nov 17, 2019 a transformer is a static device which transfers electrical energy from one circuit to another through the process of electromagnetic induction. What is the frequency of a switch mode transformer in comparison to a regular transformer. In reality, the transformer consumes some of the power. A transformer is an electrical device that changes the voltage of an ac supply. Gcse physics higher tier paper 2h specimen 2018 time allowed. Gcse physics the transformer equation voltage number. Try pdfbook and you will understand that you have found the right place. Switch mode power supply presentation rectifier power. Cleveland institute of electronics electronics symbols handbook. Kcse past papers 2017 physics paper 2 knec kcse online.
But we stated earlier that the power into a transformer is equal to the power out of the transformer, therefore the efficiency equals 100%. Jul 24, 2016 new gcse aqa physics transformers lesson. This video contains some general information about transformers, but goes on to look more specifically at the advantages of switch mode transformers, as covered by. A transformer that increases the voltage is called a stepup transformer. Tutorials, tips and advice on gcse physics coursework and exams for students, parents and teachers.
Mar 11, 2019 this tutorial explains how an endoscope works to examine and treat the inside of the body. Contains a switch mode transformer switch mode transformers and traditional transformers can both use the uk mains supply. Gcse physics the transformer equation voltage number of. Time allowed 1 hour 30 minutes instructions use black ink or black ballpoint pen. Do not write outside the box around each page or on blank pages. Show full abstract the principles of statistical physics is nowadays essential for all physicists, when there is hardly any field of pure or applied physics where statistical considerations and. General certificate of secondary education gcse and a. Learn about and revise transformer function and design, the transformer equation, and power calculations in transformers with gcse bitesize physics. Which one of the following is the correct reason for this a the internal resistance of the battery will not allow enough current in the primary coil. How much power do switch mode transformers use in comparison to a regular iron core transformer. Pdf bamboo and cane based projects pdf banana products. Physics ph3hp unit physics p3 thursday 23 may 20 9. The switch mode transformer is smaller and lighter than the traditional transformer used in the laptop charger.
Transformer, current transformers, distribution transformers repairs, transformer oil, voltage. A transformer is a passive electrical device that transfers electrical energy from one electrical circuit to another, or multiple circuits. Design and use of transformers transformers higher. Power, primary, secondary, current, voltage, 100% efficient. Same again, only different this time we connect a cell with an output of 4 volts. A transformer is an electrical apparatus designed to convert alternating current from one voltage to another. If youre thinking of switching to aqa from ocr gcse physics b gateway for teaching from september 2016, this resource will provide a helpful comparison of the subject content and assessment for each awarding body. Electricity is usually transported on the national grid at around 450,000 volts. The diagram shows that his eye lens is not able to focus light on the retina. Gcse physics from ocr physics b gateway switching to aqa.
It can be designed to step up or step down voltages and works on the magnetic induction principle. Gcse physics electromagnetism high demand questions questionsheet 1 here is a diagram of an electric bell. Further additional science fas3fp unit 3 physics p3. Aqa gcse physics third edition book where to get answers. Aqa physics p3 may 23rd 20 new spec the student room. Explain how the bell works by referring to the parts labelled a e.
Gcse physics science revision section covering circuits, electricity, current, voltage, resistance, current in a series circuit, current in a parallel circuit, voltage in a series circuit, voltage in a parallel circuit, resistance through components, charge in circuits and energy in circuits. Ac alternating currentpotential what does a transformer do. We have a brilliant team of more than 60 support team members looking after discussions on the student room, helping to make it a fun, safe and useful place to hang out. Stepup transformer, stepdown transformer pass my exams. Figure 1 shows the construction of a simple transformer. If it is assumed that a transformer is 100% efficient and this is a safe. Specified practical induced potential and transformers. Switch mode power supplies can tolerate a wide range of power frequencies and voltages. Figure 2the circuit includes an electromagnetic switch. Even today, in the pwm era, line commutated rectifiers ar e operating. Aqa p3 ppts for the transformers and transformers in action lessons of p3.
Since the voltage is increased then this means the current is reduced. A transformer that decreases the voltage is called a stepdown transformer. I would like to know if there are any general equations such as the ac transformer equations that describe a switch mode dc transformer. Switched mode power supply units psus in domestic products such as personal computers often have universal inputs, meaning that they can accept power from mains supplies throughout the world, although a manual voltage range switch may be required. To increase eddy currents in the coils which would heat it up and so make the transformer. These include descriptions of electromagnetic induction and transformer calculat. P15 homework booklet 214 229 use gcse physics book. In this paper i show the topologies and the charact eristics of a particular class of rectifiers the line commutated ones that was and still is widely used in particle accelerator facilities. It is most commonly used to increase step up or decrease step down voltage levels between circuits. Transformers will have to do a lot more than just convert voltages.
Give one other advantage of the switch mode transformer. P15 homework booklet 214 229 use gcse physics book pages. A varying current in any one coil of the transformer produces a varying magnetic flux in the transformer s core, which induces a varying electromotive force across any other coils wound around the same core. Switch mode power supply presentation free download as powerpoint presentation. One way to cause the current in the primary coil to be changing would be to put a switch in the primary circuit the circuit in which the primary coil is wired and to repeatedly open and close it. General certificate of secondary education foundation tier june 2015 physics ph3fp. Basic numeracy skills tuition for adults, including online tests many application procedures demand you sit a test set by shl or similar. Apr 28, 2014 this video contains some general information about transformers, but goes on to look more specifically at the advantages of switch mode transformers, as covered by the aqa exam board. Power, primary, secondary, current, voltage, 100% efficient course overview menu skip to content. Electricity, magnetism, and optics expandcollapse global location. Nov, 2011 this website and its content is subject to our terms and conditions. By this i mean a constant frequency dc signal 50% duty cycle that ranges from 0v to some max voltage on the primary coil and outputs some higher voltage on the secondary coil which has a larger number of turns. For a list of the major specialist physics topics we offer degree level physics tuition in, please visit the university physics tuition page.
The mode is the one that you see the most and the range is the difference inbetween. Time allowed 1 hour instructions use black ink or black ballpoint pen. This is different to the traditional transformer used in the laptop charger. Ferrite, iron, operating frequency, core, size, power usage, mobile phone chargers course overview. Tes global ltd is registered in england company no 02017289 with its registered office at 26 red lion square london wc1r 4hq. So with the primary voltage, v 1, and the number of turns on the primary coil, n 1, kept fixed, we would expect the secondary voltage. The efficiency of a transformer is the ratio of the output power to the input power. Switch mode transformers operate a high frequency between 50khz and 200khz.
As part of their work on electricity, gcse physics students will look at transformers. The filament current requires about 10 volts of current. Switch mode transformers operate at high frequency, between 50 khz and 200 khz. A step down transformer has less turns on the secondary coil that the primary coil. The main advantages of using switch mode transformers over other types of transformers are that they have a greater efficiency, they are smaller in size and lighter in weight. The output of the stepdown transformer is further fed into the rectifier. Alter how the electrical power is formed power current x voltage one goes up the other down so that the product remains constant. Smps offers advantages in terms of size, weight, cost.
Physics formulas basic formulas for physics with examples. N s is the number of turns of wire on the secondary coil. Pdf search engine, pdfbook searching for pdf documents online. Cross through any work you do not want to be marked. Figure 1 a why is iron a suitable material for the core of a transformer. Switch mode power supplies smpss are used in a range of applications as an efficient and effective source of power. Gcse physics what are advantages of a switch mode transformer. Physics of diagnostic radiology a transformer is a device that increases or decreases the voltage in a circuit a rectifier changes alternating current into direct current the electricity in a circuit in a building is 110 volts and 15 amps. Download if you would like to download a resource then click on the relevant attachment at the bottom of the page. New gcse aqa physics transformers lesson teaching resources. A transformer changes a highvoltage supply into a lowvoltage one, or vice versa. To reduce the weight of the transformer and so make it more efficient. Coates 2007 2010 introduction transformers have been an essential component in electrical and electronic circuits since the 1830s and although new. Using this site will enable you to find pdf documents and books from search engines quite simply and quickly.
Use the correct equation from the physics equations sheet. Gcse physics index transformer links to all revision. The switch mode transformer how it works gcse physics gcse physics. You must answer the questions in the spaces provided. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. Some times transformers make the output voltage bigger than the input voltage, this is a step up transformer. For anybody still working on a desktop, look for the fan output in the central processing units cpu. Gcse physics specimen question paper higher specimen. Np is the number of turns of wire on the primary coil. Give one advantage of using a switch mode transformer. A transformer is used to stepup the electricity leaving the power station to a very high voltage. Find out how by playing this quiz written by teachers to help year 10 and year 11 pupils revise.
It directly compares the current ocr specification, with our new specification for gcse physics 8463 for 2016 onwards. To reduce eddy currents in the coils which would heat it up and so make the transformer inefficient. Switch mode transformers and traditional transformers can both use the uk mains supply. The switch mode transformer how it works gcse physics gcse physics ninja. In a step up transformer there are more coils of wire on the secondary coil than on the primary coil. Physics single science physics is the study of energy, forces, mechanics, waves, and the structure of atoms and the physical universe. On our pages, we provide all physics formulas in a simple format in our effort to create a site where a scholar can get any sought after formulas. Cleveland institute of electronics electronics symbols.
Pixl gcse extension tasks gcse physics commissioned by the pixl club ltd. Issuu is a digital publishing platform that makes it simple to publish magazines, catalogs, newspapers, books, and more online. These devices convert voltage from high to low or viceversa which makes transporting and using it so much easier. Which one of the following is the correct reason for this. The induced voltage across the secondary coil is less the applied voltage across the primary coil or in other words the voltage is steppeddown.
This is where teaching and learning resources can be downloaded and added. I think this would be 5 marks the switch mode transformer operates at higher frequencies between 50 khz and 200khz. Instructions answer all questions in the spaces provided. This video contains some general information about transformers, but goes on to look more specifically at the advantages of switch mode transformers, as covered by the aqa exam board.
For examiners use question mark gcse and alevel revision. Ocr gateway gcse 91 physics for combined science student book. Further additional science fas3fp unit 3 physics p3 wednesday 20 may 2015 1. Explain the effect on the motion of the ball bearing when the switch s is closed. This tutorial explains how switch mode transformers work and compares them to traditional iron core transformers. The basic structure of a transformer is of a square of metal with a set of wires wrapped around the primary. Gcse physics foundation tier paper 1f specimen 2018 time allowed. Transformer power transfer transformers edexcel gcse. Transformer power calculation transformer power calculation.
Feb 07, 2018 i would like to know if there are any general equations such as the ac transformer equations that describe a switch mode dc transformer. Further additional science fas3fp unit 3 physics p3 f. And then it is fed to a stepdown transformer which is comparable to the weight and size characteristics of a transformer unit of 50hz. The transformer used in a modern mobile phone charger is a switch mode transformer. A transformer cannot be used to run a 230 v, 100 w mains lamp directly from a 12 v car battery. The working principle of a transformer is very simple. In examinations, answers frequently require more than 1. Why is the core of a transformer made of thin metal strips called laminations.
Gcse physics from ocr physics b gateway switching to. By this i mean a constant frequency dc signal 50% duty cycle that ranges from 0v to some max voltage on the primary coil and outputs some higher voltage on. To crack these kinds of challenges, one needs to have a proper understanding of physics formula as well as its concepts. Cleveland institute of electronics electronics symbols handbook this is a reproduction of cies classic electronics symbols handbook. Transformers change the voltage of an alternating current ac electrical supply. Gcse electricity revise how transformers convert voltage. Do not write outside the box 1 b a man, as he gets older, needs to hold a book further from his eyes in order to be able to see the writing clearly.
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