how does a transformer work gcse

  24                              22 of them! The great thing about a.c. electricity is that you can transform it! FREE Revision guides, questions banks and resources .       This video covers:- Brief summary of what transformers do (i.e. P15 Electromagnetism P15.1 Magnetic fields . Transformers are used to increase or decrease the voltage of alternating currents. Save your work forever, build multiple bibliographies, run plagiarism checks, and much more. relates the Transformers only work with alternating current. Figure shows a power supply unit found in school laboratories. 60% of members achieve a A*-B Grade. Automatically reference everything correctly with CiteThisForMe. Step up transformers change a low voltage/high current, to high voltage/low current. Transformers AQA GCSE Physics 3. If the secondary coil has half as many turns of wire then the output voltage will be half the input voltage. How Does a Transformer Work? 1. When equipment under test . Transformer Equation: We've seen that voltage can be transformed by either being increased or decreased and that this depends on the number of turns on both the primary and secondary coil. With a motor, we put electrical energy in and get rotational energy out.With a generator we put rotational energy in and get electrical energy out.. As with the motor, the current direction changes with each half turn of the generator. gcsescience.com, Home 2. Step-down transformers. This worksheet can be used as you teach so students can make notes on first page and then apply to the exam questions on reverse. up transformer to increase the voltage The main component found inside the power supply unit is a transformer . Poor regulation can introduce other problems into a circuit . 2. an alternating current in the primary coil produces a changing magnetic field in the iron core and hence in the secondary coil. A CHANGING magnetic field, however, does create an electric force which will accelerate those electrons in the other coil . A step-down transformer converts 11 500 V into 230 V. The power output is used to run a 2,000 W kettle. 4. GCSE ScienceDoodle Science teaches you high school physics in a less boring way in almost no time!Follow me: https://twitter.com/DoodleSciYou can support me . Step down voltage. This video will explain all. As the voltage goes up, the current goes down by the same proportion. A transformer that increases the voltage is called a step-up transformer. Why are transformers used in the National Grid? See the transformer equation. energy. One where the output voltage is the same as the input voltage. Put a plotting compass near one end and put a mark in the direction the arrow is pointing. Transformers and the Turns Rule. Calculate the current flowing in the primary coil. Secondary coil. current will create a magnetic Using direct current will create a magnetic field in the core but it will not be a changing magnetic field and so no voltage will be induced in the secondary coil. 60% of members achieve a A*-B Grade. In the above photograph the school transformer was used to demonstrate how voltage can be 'stepped-up' by a transformer.. 10.05 V (rounded by the meter to 10.1 V) across the primary coil of 2,000 turns resulted in an output of 100.5 V across the secondary coil of 20,000 turns. The changing magnetic field then induces alternating current of the same frequency in the secondary coil (the output). Step-up transformer. What is the life history of stars? As a result, there is now a changing magnetic field . Voltage increases. What can we say about . Transformers do not work with direct current (DC), where a steady current constantly flows in the same direction. Therefore only an alternating current works in a transformer. How does the ratio of the primary pd to the secondary pd depend on the number of turns on each coil? A transformer can change the size of an alternating voltage. Fewer turns on the secondary coil than on the primary coil. They are used in electrical power distribution and isolating circuits. All Rights Reserved. For instance, you can step its voltage up or down. A basic transformer is made from two coils of wire; a primary coil from the ac input and a secondary coil leading to the ac output. This current passes through a transformer which turns the 120 V current into usable 10 V current. Transformer Example: Here's a classic question on the workings of a transformer: Jessie builds a transformer, connected to a 12 V a.c. power supply. The relationship between primary voltage (V p), secondary voltage (V s), the number of turns on the primary . Complete until the field line is complete. The more current that flows the larger the volt drop and so the output voltage falls. Markscheme included. The power . How does the transformer work? Fewer turns on the secondary coil than on the primary coil. The 9-volt battery replacer for the radio. Yet, the solar inverter converts DC input from the PV array to AC voltage for the transformer in a smooth transition with no overvoltage from unloaded circuit. Decreasing the voltage does not decrease the power. A transformer is an electrical apparatus designed to convert alternating current from one voltage to another. They also have a number of other roles, such as: To increase the potential difference of electricity before it is transmitted across the national grid. Electromagnetism A generator is a device that produces electricity.. A simple generator is similar to an electric motor. step up or step down the voltage)- How transformers workExam board specific info:AQA - Separa.      GCSE Physics Magnetism and Electromagnetism How Transformers Work. Maths private tuition at its tuition centre can improve maths knowledge and performance through maths lessons, mathematics tutorials and maths tuition Twickenham. step up or step down the voltage)- How transformers workExam board specific info:AQA - Separate/triple science and higher tier onlyIGCSE Edexcel - Separate/triple science and higher tier onlyEdexcel - Higher tier onlyOCR 21st Century - Separate/triple science and higher tier onlyOCR Gateway - Separate/triple science and higher tier onlyMaths Playlist:https://www.youtube.com/playlist?list=PLidqqIGKox7XPh1QacLRiKto_UlnRIEVhGCSE Chemistry playlist:https://www.youtube.com/watch?v=fN8kH9Vvqo0\u0026list=PLidqqIGKox7WeOKVGHxcd69kKqtwrKl8WGCSE Biology Playlist:https://www.youtube.com/watch?v=--dIBinUdeU\u0026list=PLidqqIGKox7X5UFT-expKIuR-i-BN3Q1gGCSE Physics Playlist:https://www.youtube.com/watch?v=aHVJfRxeAxo\u0026list=PLidqqIGKox7UVC-8WC9djoeBzwxPeXph7 Assessment was by three written paper (75%) and coursework (25%). Enrol Now » Rectification. GCSE Physics: Transformers. Primary coil, secondary coil and an iron core. Using direct current will create a magnetic field in the core but it will not be a changing magnetic field and so no voltage will be induced in the secondary coil. FREE Revision guides, questions banks and resources . What are step-down transformers? A step-up transformer increases the potential difference of a power source. How do generators work? Supplies of electricity come in all shapes and sizes. The primary coil produces a magnetic field in the iron core and because of the AC in the primary coil the magnetic field in the iron core constantly changes direction which induces an alternating voltage in the secondary coil. Transformers work on the principles of . The wire must be moving . proportion. How do transformers work? they increase the voltage so that the potential difference in the primary coil is less than that in the secondary coil . Home > GCSE Physics > Transformers. A transformer is a type of static electrical equipment that . What is induction? Transformers are used within The . 5 of 13. because the changing magnetic field in In a transformer, two coils of copper wire (called the primary and the secondary) are wrapped around a circular iron core (sometimes called a . Solar transformers do require step-up duty. 3. Which coil has more turns in a step-up transformer? The reverse of this is known as a step up transformer. 1. 4 of 13. current. KS Learning can provide extra lessons for maths from gcse maths tutors in London and help with gcse maths past papers, gcse maths revision notes, and gcse maths revision worksheets. How do transformers work by electromagnetic induction? Question 2. Find my revision workbooks here: https://www.freesciencelessons.co.uk/workbooksIn this video, we look at how the generator effect is used to change the poten. input power Why do transformers only work with ac? A transformer is a device that steps-up or steps-down an alternating voltage using electromagnetic induction. This can also be an excellent homework / revision worksheet before an exam. The transformer then uses a regulator to convert the unregulated DC voltage into regulated DC output voltage. close to domestic consumers to step the voltage down to 230 V for safe use in the home. 3 of 8. 1 of 8. A magnetic field is generated as a result, which is used to drive a sound making mechanism. Move the compass so the needle is in line with the mark you just made. Transformers do not work with dc (direct current) supplies. updated Jan 30th 2020. Transformers. Full Lesson PowerPoint and resources to teach the GCSE 9-1 specification Physics lesson on Transformers and Energy. Let's start with the basics. Which type of current do transformers only work on? Created on: 14-06-12 10:45. How do transformers work in the National Grid? A transformer consists of two coils of wire wound on a metal core. transformers that: *operate at a high frequency *are much lighter and smaller than traditional transformers that work from a 50Hz mains supply *useful for mobile phone chargers *Use very little power when switched on but no load is applied Using a step up transformer to increase the voltage does not give you something for nothing. Transformers only work with alternating current. Transformers do not work with direct current (DC), where a steady current constantly flows in the same direction. So let's take one of these apart and see what's inside. Step up transformers increase the potential difference ; Step down transformers decrease the potential difference; A basic transformer consists of two coils of wire, which are not connected together. It is connected to the mains supply which supplies it with an input voltage of 240 V. Using the voltage selector, you can select output voltages from 2 V to 12 V. What changes the input voltage from 240 V to a lower output voltage? This heat is then lost to the environment, it is wasted 2 of 13. secondary coil. The National Grid carries electricity . Different types of sound making mechanisms are used to generate different sorts of noises. As the voltage goes up, the current goes down by the same proportion. (adsbygoogle = window.adsbygoogle || []).push({}); The transformer equation Learn about and revise transformer function and design, the transformer equation, and power calculations in transformers with GCSE Bitesize Physics. With one item a fault in the equipment will propbably not produce a dangerous situation. Both transformer types have the same design and construction. What is the difference between a step-up and a step-down transformer? A step up transformer has more turns of wire on the secondary coil, which makes a larger induced voltage in the . Tutorials, tips and advice on GCSE Physics coursework and exams for students, parents and teachers. You should verify the transformer you are using does provide electrically isolated outputs and doesn't supply an earth ground; check there is no continuity between the primary and secondary. Step-down transformers. The regulator is the electronic circuit that regulates the series switching element in the transformer. As part of their work on electricity, GCSE physics students will look at transformers. Please note that the last normal exam sitting for the GCSE Physics specifications was 2012. How Does a Transformer Work? Using direct When a potential difference is generated in a wire by moving it through a magnetic field. AC. Physics revision site - recommended to teachers as a resource by AQA, OCR and Edexcel examination boards - also recommended by BBC Bytesize - winner of the IOP Web Awards - 2010 - Cyberphysics - a physics revision aide for students at KS3 (SATs), KS4 (GCSE) and KS5 (A and AS level). produced/ number of turns needed to . Instead, they are . These coils .       Start revising A-level & GCSE with 7 million other students. A transformer is an electrical device that changes the potential difference (voltage) of an alternating current supply. What must be happening for a potential difference to occur in the wire during induction? GCSE Revision Quiz: Transformers. BUT with N items of equipment - if one has a fault from neutral to case or is wired wrongly this may . A step-down transformer. down by the same Connecting 230 V to . One where the output voltage is larger than the input voltage. It is called a step down transformer because the output voltage is smaller than the input voltage. GCSE Chemistry What do step-down transformers do? If you appreciate the help, consider tipping me to keep me going :) h. Principle of Transformers . Physics Quiz A transformer consists of two coils (one coil is the primary coil the other is the secondary coil) wrapped around a metal core. One where the output . The most basic transformer consists of two coils of wire wound around a core made of a magnetizable material (typically soft iron). creates currents (called eddy currents) which heat the core. Theoretically, we can operate any transformer as a step-up as well as a step-down type. Revision Questions, gcsescience.com (see images ---) When an alternating current passes through the primary coil and magnetic field in . number of turns of wire field in the core Index If the first coil has more turns that the second coil, the secondary voltage is smaller than the primary voltage: This is called a . and relatively low . Why do we need to do adjust the voltage for appliances to work, you ask?       The microphone works by producing a small induced voltage in a coil of wire when sound waves hit a diaphragm. Transformer Quiz 1 of 11. That is the reason why it can work as a voltage step-up or step down transformer.                           to the difference in voltage Transformers are not perfect and impedance exists in them that causes a volt drop within the transformer when current flows. What do step-up transformers do? This video covers:- Brief summary of what transformers do (i.e. What is meant by a step down transformer? Enrol Now » Rectification. the core The current then passes through the electromagnetic wire winding. The relationship between primary voltage (V p), secondary voltage (V s), the number of turns on the primary . gcsescience.com           that the As the voltage Electromagnetism. You should know why transformers are an essential part of the National Grid.. You also need to know why the long distance power lines use a very high p.d. Will a transformer work with direct current (d.c.) or alternating current (a.c.)? For a given power increasing the voltage reduces the current required and this reduces the energy losses in the cables. Figure shows a power supply unit found in school laboratories. edited Mar 3 '11 at 17:12. For instance, you can step its voltage up or down. It is very similar to a loudspeaker in reverse with a diaphragm instead of a paper cone. Question 1. She has 200 turns on the primary and 40 turns on the secondary. 5. It is connected to the mains supply which supplies it with an input voltage of 240 V. Using the voltage selector, you can select output voltages from 2 V to 12 V. What changes the input voltage from 240 V to a lower output voltage? Why do Transformers only work with AC GCSE? RCDs work in a similar way to electricity transformers; if you're not familiar with those, you might find it helpful to review our detailed article on transformers so you understand what's coming up next. A transformer has no moving parts and is a completely This is the eighth lesson in the Electromagnetism unit of work (P7). Help with GCSE Physics, AQA syllabus A AS Level and A2 Level physics. An LV winding wire has a bigger cross . For a transformer to work, the current in one coil has to somehow make current flow in the other coil and the circuit it's connected to. A more in-depth look at transformers and also the transformer equation is covered in this video (Separate GCSE Physics higher tier only). Age: 14-16 Year Olds. The HV windings contain a huge number of turns compared with the LV windings. It covers how the national grid transmits electricity around the country, why step-up and step-down transformers are used, that transformers can change the voltage of an alternating current, how a transformer works, the factors that affect the size and direction of an induced . How does a switch mode transformer differ from an ordinary transformer? Murphy / circumstance will work to defeat this isoation. secondary coils. How does a transformer work? Transformer Equation: We've seen that voltage can be transformed by either being increased or decreased and that this depends on the number of turns on both the primary and secondary coil. From the information, we can say V p = 12 V, N p = 200 . The coils are not electrically connected. What is the core of a transformer made from? The radio shack universal power cube. but it will not be a changing magnetic field These devices convert voltage from high to low or vice-versa which makes transporting and using it so much easier. Links Place a magnet on a piece of paper and draw around it. Induction. These . Tutorials, tips and advice on GCSE Physics coursework and exams for students, parents and teachers. How transformers work. http://scienceshorts.net Please don't forget to leave a like if you found this helpful! 1 2 3.   How does a Step Up Transformer Work? Where Vp is the between the primary and It can be designed to "step up" or "step down" voltages and works on the magnetic induction principle. What is the key word: When a potential difference is generated in a wire by moving it through a magnetic field. overall power remains the same. If a transformer has 5 coils on the primary, and 10 on the secondary, it will be a 1:2 step-up transformer, meaning the voltage doubles from the primary . An alternating input is supplied to the primary coil which produces an alternating magnetic field in the iron core. The following equation can be used to calculate the p.d. This type of microphone is called a moving coil microphone. A transformer is an electrical device that changes the potential difference (voltage) of an alternating current supply. The iron core is easily magnetised, so the changing magnetic field passes through it. The regulation of a transformer is the difference in the no-load voltage to the full load voltage expressed as a percentage. The great thing about a.c. electricity is that you can transform it! But you have to plug them in to the mains to recharge their batteries! This means it will produce a changing magnetic field around the primary coil. What is a Generator?. number of turns of wire on the and so no voltage will be induced in the secondary coil. How does a Microphone Work? PLAY. Step-down transformers are used in mains adapters and rechargers for mobile phones and CD players. If the first coil has more turns that the second coil, the secondary voltage is smaller than the primary voltage: This is called a . GCSE Physics Magnetism and Electromagnetism How Transformers Work. The transformer has done its job. Find out how by playing this quiz written by teachers to help Year 10 and Year 11 pupils revise. How Does a Transformer Work? does not give you something for nothing. Because solar transformers operate at a steady voltage, with the rated voltage controlled by inverters, voltage and load fluctuations are considerably lower than in wind turbines. What three things do transformers need to work? 6 of 13. Physics revision site - recommended to teachers as a resource by AQA, OCR and Edexcel examination boards - also recommended by BBC Bytesize - winner of the IOP Web Awards - 2010 - Cyberphysics - a physics revision aide for students at KS3 (SATs), KS4 (GCSE) and KS5 (A and AS level). These . Small things - like mobile phones - often run on batteries. If you wish to take Physics exams in 2014 (or later years), you will need to study . An alternating input voltage. How do transformers work? A step-up transformer has more turns on the secondary coil than on the primary coil; A step-down transformer decreases the potential difference of a power source. This is done simply by adjusting the ratio of coils on one side to the other.              gcsescience.com. Step up transformers increase the potential difference ; Step down transformers decrease the potential difference; A basic transformer consists of two coils of wire, which are not connected together. A transformer is a device that adjusts the voltage of electricity that pumps through your appliances in your home. What are . A transformer's main function is to step-up or step-down the voltage from the primary to the secondary windings. Well, the power that is transported to the utility lines from the power plants produces high voltage as it travels to your . the power in = the power out, because Power = Volts x Amps. Transformers are used to change the potential difference along wires. The lesson covers transformer design, the mathematical formulae to calculate potential difference and current across the coils and also how transformers are used in the National Grid and at home. A step-down transformer is a type of transformer that converts the high voltage (HV) and low current from the primary side of the transformer to the low voltage (LV) and high current value on the secondary side of the transformer.