Earth wires and fuses work together in uk mains circuits to keep users safe from. Without an earth wire, electricity could begin to flow through the metal casing if a fault developed. Cables and plugs gcse aqa physics linkedin slideshare. Fuse and circuit breakers mini physics learn physics. Resources resources home early years prek and kindergarten primary elementary middle school secondary high school whole school special educational needs blog. The pastoral ideal has been celebrated and explored in literature since virgil and ovid in the first century bc. Book pushes down on table, table pushes up on book. Cables and plugs gcse aqa to be able to understand the dangers of electricity without fuses to be able to increase our knowledge on live, neutral and earth wires 6. Longman physics homework for edexcel igcse page 31. Different types of fuses are available in the market and they are classified on the basis of different aspects. The plug electrical safety gcse physics single science. Dec 26, 2015 need for earthing and double insulation wiring a mains plug in order to prevent excessive currents flowing into the home circuit, electrical appliances and its cables, fuses and circuit breakers are wired into the live wire and used as safety devices.
What other answers havent mentioned is earthing or protectiveearth wiring pe. Progress test edexcel igcse physics student book end of chapter checklists. A circuit breaker is composed of a springloaded push switch, a springloaded soft iron bolt and an electromagnet. See more ideas about physics, igcse physics and physical science. A fuse is an electrical wire which is thick enough to allow the required current for the device to pass through it, but thin enough to melt and break the. By rearranging the equation piv we can work out the best fuse to use. Read this book, get grounded, and start the process of breaking the stress and illness cycle. A completely resourced lesson on gcse physics p2 fuses, circuit breakers and rccbs including key content from aqa exam specification. When all metallic parts in electrical equipments are grounded then if the insulation inside the equipments fails there are no dangerous voltages present in the equipment case. To be able to understand the dangers of electricity without fuses to be able. Learn how earthing or grounding can promote health and healing in the body with this landmark book by clint ober, dr stephen sinatra and martin zucker. The electrical earthing is done by connecting the noncurrent carrying part of the equipment or neutral of supply system to the ground.
The best fuse to use in this example would be the a fuse. The earth wire is green and yellow and is a safety device designed to protect people from shocks. A 3 amp fuse is red, a 5 amp fuse is black or very dark blue, a amp fuse is brown. Thanks for contributing an answer to physics stack exchange. Edexcel international gcse physics student book pages 7479 and 8287, 80, 88 and 89. An earth wire is essential for any appliance with a metal case. This book is a sales pitch with all research provided by the people selling earthing products. Gittleman earthing connects us to nature and nature is the ultimate source of health and healing. Physics gcse science revision electricity the role of the earth wire. These standards apply in the uk and also ireland, malaysia, hong. Worlds best powerpoint templates crystalgraphics offers more powerpoint templates than anyone else in the world, with over 4 million to choose from. The fuse is a device that melts and breaks the circuit when the current gets too high. Find all the books, read about the author, and more. Its more convenient than a fuse because you can simply switch it back on again.
Edexcel igcse physics archives tutormyself chemistry. Hence, the earthing will divert the current into the earth by providing an alternate path to the large current flow via the earth wire, rather than through the users body. This book is probably the most important health read of the 21st centur ann louise gittleman, ph. Help with gcse physics, aqa syllabus a as level and a2 level physics. Waves consolidation and assessment revision exercises. This book offered a fascinated look at the history and science behind earthing, or grounding as its more commonly known. The 3a and 5a fuses would blow even when the fire was working normally. If the live wire becomes loose and touches the metal. Earthing book by clint ober, dr stephen sinatra and martin zucker. A fuse is usually made up of a tincoated copper wire. Mar 09, 2014 fuses play an important role in making sure our appliances dont fry when a surge of electricity flows through them.
Edexcel igcse physics student book pages 107108, 116 and 126. This website and its content is subject to our terms and conditions. Mains electricity gcse aqa to know what is meant by direct current and alternating current. I am currently a lecturer in engineering design at a university, prior to this i worked in secondary schools as a specialist physics teacher. Because the case is connected to the earth wire, a large current flows to earth, this causes the fuse to blow, and breaks the. Ostensibly it describes a rural paradise where man is completely at one with nature, lives on the land and is innocent, pure and all in order. Of course, for the most part those ancestors, grounded or not, lived short, hard lives for a variety of reasons, so it is difficult to draw conclusions about the effect of. Learn vocabulary, terms, and more with flashcards, games, and other study tools. A fuse is an electrical wire which is thick enough to allow the required current for the device to pass through it, but thin enough to melt and break the circuit if too much current flows. Sometimes a live wire may come in contact with a metal casing of a device. Feb 10, 2015 domestic mains electricity basics explained, suitable for gcse and general information. Nov 27, 2011 the main reason for doing earthing in electrical network is for the safety.
Earthing prevents electric shocks from metal objects if the outer casing the outside bit of an appliance is made of metal a good conductor then it can be made safe by earthing how does the earth wire make an appliance safe the earth wire usually carries no electricity. The case is made of plastic an insulator for safety. Electrical wiring and safety st edmunds girls school. Earthing, or grounding, is a revolutionary method of balancing oneself by reconnecting with the earths electrical potential. If the live wire touches the grounded case then the circuit is effectively shorted. Earthing book by clint ober, dr stephen sinatra and martin. A fuse is an electrical safety device built around a conductive strip that is designed to melt and separate in the event of excessive current. Theyll give your presentations a professional, memorable appearance the kind of sophisticated look that todays audiences expect. If the current is too high the circuit breaker switches to off, breaking the flow of current. Earthing electricity in the home ccea gcse physics. Without the earth wire, if a fault occurs and the live wire becomes loose, there is a danger that it will touch the metal case. Our physics book says that the earth wire and the neutral wire are connected together at the supply centre and then both are exposed to.
Physics section 1 fuses and circuit breakers flashcards. Fuses work on the principal of a large current melting the fuse wire. Show the difference between real and virtual images. These standards apply in the uk and also ireland, malaysia, hong kong, malta, singapore, saudi arabia and. Edexcel igcse physics 2p 17th june predictions the. There are some appliances which do not have an earth wire. Start studying physics section 1 fuses and circuit breakers. If the concrete floor is a resistor, it could be way too high a resistance to light a bulb, yet way too low to prevent the shock.
Q6 a kettle is protected by an earth wire and a a fuse. They are now not in print as a new book has been published that is relevant to the new syllabus. Test yourself question 25 on page 52 of the textbook physics only wont take very long. Winner of the standing ovation award for best powerpoint templates from presentations magazine. The process of transferring the immediate discharge of the electrical energy directly to the earth by the help of the low resistance wire is known as the electrical earthing. Electrical safety devices electrical energy in the home. The markings on the fuse carry information such as the ampere rating, voltage rating and interruption rating. Gallaghers guide to 21st century medicine wonderful book. Read all about the earths natural healing potential to alleviate their aches and pains, inflammation, sleep disorders and free radical damage in this ground breaking book. Tonbridge school edexcel igcse in physics 4ph0 edexcel igcse in science double award 4sc0 revision january 2014 information this document is simply a check list for the revision you should have done. Demonstrating earth connections and fuses working together. Gcse sciencesafety in mains circuits wikibooks, open books for. Domestic mains electricity basics explained, suitable for gcse and general information. Insulation, earthing, fuses and circuit breakers help to protect us from electrical injury.
Earthing ranks right up there with the discovery of penicillin. Components of electrical earthing system earth continuity conductor or earth wire. In order to prevent excessive currents flowing into the home circuit, electrical appliances and its cables, fuses and circuit breakers are wired into the live wire and used as safety devices. What a surge is and how it can cause harm how safety features can protect us from that harm in particular.
Earthing is a return to the healing power of nature. Doodle science teaches you high school physics in a less boring way in almost no time. The next person who uses the appliance could get electrocuted. Written by expert teachers for the cie igcse 91 0972 ag 0625. Earthing grounding quiz questions electrician exams. The research the authors provide uses about three pages for the nearly 200 pages of testimonial. Slightly higher than the normal working current of the appliance, but if it is much higher it will not melt soon enough. Sometimes a live wire may come in contact with a metal casing of a device this will not cause a fuse to blow. Earthing something means dumping the electron flow into the earth.
Tes global ltd is registered in england company no 02017289 with its registered office at 26 red lion square london wc1r 4hq. Power is a measure of how quickly energy is transferred and its measured in watts. A fuse is an electrical component which is placed in an electrical circuit for protection against electrical faults such as a current surge. For protection against faults of this nature a circuitbreaker is used in place of a fuse. Read all about the earths natural healing potential to alleviate their aches and pains, inflammation, sleep disorders and free radical damage in. Need for earthing and double insulation mini physics. Physics stack exchange is a question and answer site for active researchers, academics and students of physics. Earthing the role of the earth wire is to form a save route for a current to flow through in case the live wire should move and touch the casing. Earthing and double insulation electrical safety gcse. Since the earth is so big, it can absorbegive a practically infinite amount of charge without changing potential, this means that you can treat earth as a reservoir of ready to use electrons. Fuses have different colours for different ratings. Aqa 2016 gcse physics 8463 specification from september 2016. Fuses these are important safety devices which blow if the current exceeds the rating of the individual fuse.
In some cases faults can occur in which the current may not be large enough to melt the fuse but enough to seriously harm the user of the electrical appliance. But avoid asking for help, clarification, or responding to other answers. If the live wire touches the grounded case then the circuit is effectively shorted and fuse. An earth wire is a good conductor and connects the neutral wire in the fuse box and the individual power outlets in the house to the earth. Live, neutral, earth, plugs, fuses and circuit breakers. Electrical energy is current multiplied by voltage and time. Edexcel international gcse 2009 physics 4ph0 and khp0. Most electrical appliances, like fridges and cookers, are contained within a metal case so if this was to happen and there was no earth wire youd get an electric shock if you touched the metal.
However, as the genre developed over the centuries, particularly in the 18 th and 19 th centuries, it became a way for writers to critique. Earthing earthing is a process used to increase the safety of electrical appliances and prevent electric shocks. Fuses are overcurrent protection a 10a fuse might help prevent a fire, since it limits the power that an appliance can receive. Edexcel igcse physics 2p 17th june predictions the student room. The 91 edexcel specification for gcse physics, examined from summer 2018. Earthing is a revolutionary health breakthrough that will change your life. Edexcel international gcse 2009 in physics 4ph0 and edexcel level1level 2 certificate in physics kph0 the number of guided learning hours required for this qualification is 120140, which equates to approximately 2 hours per week over 60 weeks and reflects how centres will use time for practical activities differently. Fuses physics of conductors and insulators electronics textbook. Earthing enthusiasts claim that throughout history, our ancestors walked barefoot or wore shoes made from animal skins, which gave them direct contact with the earth. Grounding or earthing quiz questions answers search for.
Edexcel igcse physics 2p 17th june predictions watch. Packed with research and reallife testimonials on a wide range of health issues including inflammation, sleep problems, poor blood circulation, swollen joints, arthritis, sleep apnea, hormonal. But mainly, fuses can be divided into two categories based on the input supply as follows. Mains electricity what is earthing mains electricity uses earthing as a safety measure. Earthing or an earth wire is fitted in order to protect people from an electric shock from electrical appliances. Everyday low prices and free delivery on eligible orders. Edexcel international gcse 2009 in physics 4ph0 and edexcel level 1level 2 certificate in physics kph0. Circuit breakers are also used to protect appliances and electrical circuits. The main reason for doing earthing in electrical network is for the safety. The physics exam will take place in january 2014 in old big school and big school. Gcse sciencesafety in mains circuits wikibooks, open. It delves fairly deep into the technical aspects of it which i really enjoyed and has a ton of stories from people who have had their lives changed.