Electric Fuse
Electric Fuse
|
Many electrical appliances are designed to work at a particular rated current. Passage of current greater than the rated current will damage the appliance. To prevent electric appliances from getting damaged from an excessive flow of current, a safety device called a fuse is used. A fuse is a safety device which is used to control the current in an electric circuit. It is connected in series with the mains supply. A fuse consists of an alloy of lead and tin which has appropriate melting point. Characteristics of a Fuse: It has a short length wire with a low melting point. The fuse wire is made an alloy containing equal amounts of lead and tin. It melts at about Principle of an Fuse: The electric fuse works on the principle of heating effect of current. The amount of heating caused depends on the amount of current. An electric fuse consists of a thin wire usually placed inside a glass or ceramic cartridge. The wire is made of a material that melts easily when heated. Working of a Fuse: A wire becomes heated when electric current passes through it. Wires made up of some special material that melts quickly and break when large electric currents are passed through them. Fuses of different kinds are used for different purposes. Different fuse wires can have different thickness. Thicker wires can withstand more electric current. There is a maximum limit on the current which can pass through an appliance or circuit. If by accident the current exceeds the limits, this excess current will pass through the fuse wire and melt it. Tthe circuit is broken. This will stop the passage of the current and the appliance is saved.
When the current flowing through the circuit exceeds the safe limit, the temperature of the fuse wire increases melts and breaks the circuit. It is required to rate the fuses for different current values such as 1 A, 2 A 5 A, 10 A, 15 A, etc. According to the devices used in the circuit we can calculate the amount of current that should allowed to flow through the circuit. A fuse with a rating little more than this value is used in series with the circuit to prevent the damaging of the devices. Fuses and Circuit Breakers: A fuse is a safety device that acts as a switch. Fuses are connected into the circuit close to the source. As a result all the current flowing in the circuit passes through the fuse. When too much current flows, the fuse heats up sufficiently to bum out. This creates an air gap and no more current flows. Illustration: An electrician puts a fuse of rating 5 A in that part of domestic electrical circuit in which an electric heater of rating 1.5 kW, happen in this case and why ? Solution: According to the question p=1.5 kW V = 220 V The current drawn by heater can be calculated using the formula
|
State true or false using codes given below. I. A fuse is used to complete or break an electric circuit. II. Current in a cell flows from positive terminal to negative terminal. III. A circuit is said to be open if current flows through it. IV. A filament is a part of bulb which glows when current pass through it. | |||
| Right Option : D | |||
| View Explanation | |||
Select the one that is a necessary requirement for a wire to be used as fuse wire : | |||
| Right Option : A | |||
| View Explanation | |||
Select the one that is a necessary requirement for a wire to be used as a fuse wire.
| |||
| Right Option : A | |||
| View Explanation | |||
Students / Parents Reviews [20]
Abhyas is good institution and a innovative institute also. It is a good platform of beginners.Due to Abhyas,he has got knoweledge about reasoning and confidence.My son has improved his vocabulary because of Abhyas.Teacher have very friendly atmosphere also.
Manish Kumar
10thAbhyas institute is one of the best coaching institute in the vicinity of Ambala cantt.The institute provides good and quality education to the students.The teachers are well experienced and are very helpful in solving the problems. The major advantages of the institute is extra classes for weak...
Shreya Shrivastava
8thAbhyas academy is great place to learn. I have learnt a lot here they have finished my fear of not answering.It has created a habit of self studying in me.The teachers here are very supportive and helpful. Earlier my maths and science was good but now it has been much better than before.
Barkha Arora
10thIt was good as the experience because as we had come here we had been improved in a such envirnment created here.Extra is taught which is beneficial for future.
Eshan Arora
8thAbout Abhyas metholodology the teachers are very nice and hardworking toward students.The Centre Head Mrs Anu Sethi is also a brilliant teacher.Abhyas has taught me how to overcome problems and has always taken my doubts and suppoeted me.
Shreya Shrivastava
8thMy experience with Abhyas Academy has been very good. When I was not in Abhyas whenever teacher ask questions I could not speak it confidently but when I came in Abhyas, my speaking skills developed and now I am the first one to give the answer of teachers question.
Upmanyu Sharma
7thAbhyas is a complete education Institute. Here extreme care is taken by teacher with the help of regular exam. Extra classes also conducted by the institute, if the student is weak.
Om Umang
10thMy experience was very good with Abhyas academy. I am studying here from 6th class and I am satisfied by its results in my life. I improved a lot here ahead of school syllabus.
Ayan Ghosh
8thBeing a parent, I saw my daughter improvement in her studies by seeing a good result in all day to day compititive exam TMO, NSO, IEO etc and as well as studies. I have got a fruitful result from my daughter.
Prisha Gupta
8thMy experience with Abhyas academy is very nice or it can be said wonderful. I have been studying here from seven class. I have been completing my journey of three years. I am tinking that I should join Abhyas Academy in tenth class as I am seeing much improvement in Maths and English
Hridey Preet
9thIn terms of methodology I want to say that institute provides expert guidence and results oriented monitering supplements by requsite study material along with regular tests which help the students to improve their education skills.The techniques of providing education helps the students to asses...
Aman Kumar Shrivastava
10thAbhyas institute is one of the best coaching institute in the vicinity of Ambala Cantt area. The teachers of the institute are well experienced and very helpful in solving the problems of the students.The good thing of the institute is that it is providing extra classes for the students who are w...
Aman Kumar Shrivastava
10thWe started with lot of hope that Abhyas will help in better understnding of complex topics of highers classes. we are not disappointed with the progress our child has made after attending Abhyas. Though need to mention that we expected a lot more. On a scale of 1-10, we would give may be 7.
Manya
8thOne of the best institutes to develope a child interest in studies.Provides SST and English knowledge also unlike other institutes. Teachers are co operative and friendly online tests andPPT develope practical knowledge also.
Aman Kumar Shrivastava
10thAbhyas Methodology is very good. It is based on according to student and each child manages accordingly to its properly. Methodology has improved the abilities of students to shine them in future.
Manish Kumar
10thAbhyas is an institute of high repute. Yogansh has taken admission last year. It creates abilities in child to prepare for competitive exams. Students are motivated by living prizes on basis of performance in Abhyas exams. He is satisfied with institute.
Yogansh Nyasi
7thMy experience with Abhyas academy is very good. I did not think that my every subject coming here will be so strong. The main thing is that the online tests had made me learn here more things.
Hiya Gupta
8thIt has a great methodology. Students here can get analysis to their test quickly.We can learn easily through PPTs and the testing methods are good. We know that where we have to practice
Barkha Arora
10thMy experience with Abhyas is very good. I have learnt many things here like vedic maths and reasoning also. Teachers here first take our doubts and then there are assignments to verify our weak points.
Shivam Rana
7thThird consective year,my ward is in Abhyas with nice experience of admin and transport support.Educational standard of the institute recumbent at satisfactory level. One thing would live to bring in notice that last year study books was distributed after half of the session was over,though study ...
