When the MCB is re-set, the circuit becomes, complete and electric current starts flowing in the household wiring again. is produced in the connecting wires of copper because copper has very low resistance. 14.10 seconds touch the wire. The part of electric heating appliance which ‘heats up’ on passing current is called heating element of the appliance. So they do not waste electricity by producing heat and hence they are very power efficient. The metal caps are for connecting the fuse in the circuit in a suitably made bracket. The fuses used in individual electrical appliances are called cartridge fuses. The credit for the invention of the electric bulb is usually given to Thomas Alva Edison, though others before him had worked on it. Heating elements have wire coils which produce heat. We use a thin wire in a fuse because it has a much greater resistance than the rest of connecting wires. It has gotten 1371 views and also has 4.8 rating. automatically cut off before any damage can be done to the rest of wiring or to the electrical appliances being used. This is known as overloading. In household electric wiring, electric current is supplied through two insulated wires, which run together and reach each and every electrical appliance. (a) A bad conductor of electricity but good conductor of heat (i) CFL (b) A wire twisted Nichrome many times in the form of circles (ii) Nichrome (c) Smart eco-friendly bulb (iii) Mica (d) An alloy whose temperature can rise up to \[{{900}^{o}}C\]and used as heating Element (iv) Coil The heating elements of most of the electric heating. MCB is a special kind of electrical switch which automatically turns off when the current in the circuit becomes too large, and cuts off the electricity supply. The most convenient source of energy is electricity. MCQ Questions for Class 7 Science with Answers were prepared based on the latest exam pattern. MCQ Questions for Class 7 Science: Ch 14 Electric Current and Its effects. The electric bulb has a very thin filament of tungsten metal. Heating effect of electric current is used in (a) Electric watch (b) Bread toaster (c) Switch (d) None of these (b) Bread toaster. 1)Electric heater,iron,water heater work on heating effect of current. The glass tube has two metal caps at its two ends. When a short circuit or overloading occurs, the fuse wire blows out cutting off the electricity supply. concealed inside the body of these appliances. Different factors affect these benefits such as … Electric Current and Its Effects Class 7 Science Extra Questions Short Answer Type Questions. The element, becomes red-hot because a lot of heat is produced in it on passing current (because of the high resistance, of nichrome coil). Here we have given NCERT Class 7 Science Notes Chapter 14 Electric Current and Its Effects. The coil of high resistance wire (or coil of nichrome wire) present in an electric heating appliance, heating appliance which ‘heats up’ on passing current. A fuse works on the heating effect of current. The two ends of the fuse wire are, connected to these metal caps. This is called heating effect of electric current. The inside of glass tube is coated with an opaque, white material called phosphor. Name two electric devices for each where (a) heating effect of current is used and (b) magnetic effect of current is used. This type of circuit is called an Open Circuit. A fuse consists of a short length of a thin, tin-plated copper wire having low melting point. Do check out the sample questions of Heating Effects of Electric Current Class 7 Video | EduRev for Class 7, the answers and examples explain the meaning (3)The heating effect of electric current is utilised in a safety device called ‘electric fuse’ Electric Heating Appliances. This is the heating effect of current. Question 6 When does an electric short circuit occur? MCB stands for Miniature Circuit Breaker. When, a short circuit or overloading occurs, the fuse wire blows out cutting off the electricity supply. contains mercury vapour. Electric fuses are inserted in the wiring (or circuits) of, connected in the household circuit The fuse grip has a, fuse wire fixed in it. traditional, filament-type electric bulbs). Question 12 give few advantages of CFLs over filament type bulbs? An electric fuse is used to ‘make’ or ‘break’ an electric circuit. Question 1. The production of heat by an electric bulb is not desirable because it leads to the wastage of electricity. Heating Effect of Electric Current; Electric Current and its Effects. Your email address will not be published. Also, a thick wire has less resistance whereas a thin wire has more resistance. CBSE Class 7 Science Notes Chapter 14 Electric Current and Its Effects. The amount of heat produced in a wire due to heating effect of current depends on two factors: (1) Resistance of wire (This depends on material of wire , length of wire and thickness of wire). Filed Under: Class 7, Electric Current and its Effects, Science. work on the heating effect of current. EduRev by using search above. There is a maximum limit on the current which can flow safely through the fuse wire inserted in the household circuit. When a switch is in OFF position, (i) circuit starting from positive terminal of the cell stops at the … The same current flowing through the tungsten filament of an electric bulb produces enormous heat but almost negligible heat is produced in the connecting wires of copper. This is called the heating effect of current. Due to its high resistance, the heating effect of current will be much more in the fuse wire than anywhere else in the circuit. electrical appliances such as TV and refrigerator could also damage them. To Study Heating Effects of Electric Current Class 7 Video | EduRev for Class 7 this is your one stop solution. The thickness of the fuse wire should be such that it is able to withstand only a little more current than drawn by the household circuit. If you Electric Bulb: Electric bulb consists of a filament. This large current may heat the wires to a dangerously high temperature and a fire may be started.We should never use such an electrical appliance having connecting cable with torn insulation. Register for free now! Open electric circuit. What effect does the current produce when it flows through a conducting solution? Class 7 Heating Effects of Electric Current Class 7 Video | EduRev Summary and Exercise Nichrome has a very high resistance so if the same electric current is passed through a nichrome wire, then the heat produced in it will be too much (due to which it will become very hot).The elements of electric heating appliances (such as electric room heater, electric iron, etc.) Question 3 Explain why filament type electric bulb are not power efficient? When a fluorescent tube light (or lamp is switched on and current passes through it, the mercury vapour emits invisible ultraviolet radiations and glows (or fluoresces) to emit white light. A lot of heat is produced in the heating element because it is made of high resistance nichrome wire. Question 7 Give few applications of heating effect of current? You can also find Heating Effects of Electric Current Class 7 Video | EduRev ppt and other Class 7 slides as well. much (due to which it will become very hot). If due to some reason, the current in household wiring suddenly becomes too large (and exceeds the safe limit), then the fuse will blow off (its wire will get heated too much, melt and break the circuit). If due to some reason, the current in household wiring suddenly becomes too large, (and exceeds the safe limit), then the fuse will blow off (its wire will get heated too much, melt and, break the circuit). When a fuse gets blown (or breaks), a new fuse has to be fitted in its place to restore the electricity, connecting wires. When the fuse wire breaks, electricity supply in the household wiring is automatically cut off before any damage can be done to the rest of wiring or to the electrical appliances being used. However, if an excess of current is passed through a wire it can melt or break. Nov 28, 2020 - Applications of Heating Effect of Electric Current Class 7 Video | EduRev is made by best teachers of Class 7. The factors that affect the production of heat in a wire through which an electric current flows are the length and thickness of the wire, the duration of flow of current… It, consists of a glass tube having a thin fuse, wire sealed inside it. All the electric heating appliances contain coils of high resistance wire made of alloy. [NCERT Exemplar] Answer: (a) Heating effect of current is used in electric heater and geyser. Applications of Heating Effect of Electric Current . (4) Now pass the electric current in the circuit by moving the switch, to ‘on’ position (by closing the gap). The inside of glass tube is coated with an opaque, white, through it, the mercury vapour emits invisible ultraviolet, radiations and glows (or fluoresces) to emit white light. Thank you and keep it up. We should not use a thick wire as a fuse wire because it will have a low resistance and hence it will not get heated to its melting point easily. to which the heat produced in them is negligible). Thus, unlike a fuse which can be used only once and has to be replaced (when its wire melts and breaks), the same MCB can be re-set manually to restore electricity supply. protect the appliance from damage which could have been caused if the large current had passed through it. Similarly, when electric current is passed into an electric iron, the element of electric iron (made of nichrome coil) becomes red-hot and produces heat. This video is highly rated by Class 7 students and has been viewed 1041 times. sure that we buy good quality MCBs, we should look for ISI mark on them. books of Class 7. These days MCBs (miniature circuit breakers) are being used increasingly in household electrical switch in place of traditional fuses. Let us find out. work on the heating effect of current. When electric current flows through a conducting wire, the temperature of wire increases. Fig. (2) The heating effect of electric current is utilised in electric bulbs (or electric lamps) for producing light. Applications of Heating Effect of Electric Current, RD Sharma Solutions for Class 7 Mathematics. It may be very, The same current flowing through the tungsten filament of an electric bulb produces, enormous heat but almost negligible heat is produced in the connecting wires of copper. The coil of high resistance wire (or coil of nichrome wire) present in an electric heating appliance is called the heating element of the appliance. When an electric current flows through a wire, the wire gets hot. The metal caps are for connecting the fuse in the circuit in a suitably made, bracket. Due to this the filament of electric bulb gets heated to a very high temperature and start, electricity consumed by the filament of an electric bulb appears as heat due to which the glowing electric bulb becomes, quite hot.We should never touch a glowing electric bulb connected to the mains electricity. The ISI mark ensures that the. Switch on the current. This large current may heat the wires to a dangerously high temperature and a fire may be started.We should never use such an electrical appliance having connecting cable with torn insulation. refrigerator) due to a large current flowing through them. This is due to the conversion of some of the electrical energy that passes through the conductor, into heat energy. A, small current passing in a wire produces less heat but a large current passing through the same, Applications of the Heating Effect of Current. This, Fuses are also used to protect the individual domestic electrical appliances from, damage which may be caused due to excessive current flow through them. Some of the important applications of the heating effect of current are given below: (1) The heating effect of electric current is utilised in the working of electrical heating appliances such as electric room heater, electric iron, electric kettle, electric toaster, electric oven, water heater (geyser), immersion rod, and soldering iron, etc. So, the filament-type electric bulbs are not. By continuing, I agree that I am at least 13 years old and have read and agree to the. Different ways of representing the quantitative relations for Heating effect of electric current are as follows or H = I 2 Rt= VIt = V 2 t/R Joule. When a fuse gets blown (or breaks), a new fuse has to be fitted in its place to restore the electricity supply in the household circuit. The, copper wires used for making electric circuits in science activities, normally do not become hot on passing electric current because they have very low resistance (due. appliance is safe and energy efficient (the wastage of energy being the minimum). (2) They can be fixed in ordinary bulb holders (which are used for traditional, filament-type electric bulbs). So they do not waste electricity by, producing heat and hence they are very power, ordinary bulb holders (which are used for. The hot electric iron is then used for ironing clothes. appliances (such as electric iron, electric kettle, electric geyser, electric oven, hotplates and hair, dryers, etc.) The cord of heater made of copper does not become red-hot or, low because a negligible heat is produced in it on passing current (due to its extremely low resistance), Similarly, when electric current is passed into an, nichrome coil) becomes red-hot and produces heat. When a switch is in OFF position, (i) circuit starting from the positive terminal of the cell stops at the … Chemical Effects of Electric Current Class 8 MCQs Questions with Answers. work on the heating effect of current. I really loved the way you explained the complicated subject in a clear and simple way. 3)Directly proportional to time for which electric current flow through conductor. This is the heating effect of current. Appliances which require heating effect have conductors or the heating elements. A copper metal wire (or any other metal wire or metal strip) should not be used as a fuse wire because it has a high melting point due to which it will not melt easily when a large current passes through it. The electric heating appliances (such as electric room heater, electric iron, etc.) (6) We should not keep the switch in the ‘on’ position for a long time otherwise the electric cell will get damaged and become weak very quickly. to which it will not melt easily when a large current passes through it. These days MCBs, (miniature circuit breakers) are being used increasingly in household electrical switch. Due to this the filament of electric bulb gets heated to a very high temperature and start glowing. An electric current is passing through a conductor which becomes hot after some time and produces heat. Thus, nichrome wire is resistance wire. Meaning of Heating Effect When an electric current passes through a conductor (like a high resistance wire) the conductor becomes hot after some time and produces heat This is called heating effect of Electric Current Example 1 A bulb becomes hot after its use for some time.This is because of heating effect of electric current Example 2 EduRev is a knowledge-sharing community that depends on everyone being able to pitch in when they know something. (6) We should not keep the switch in the ‘on’ position for, a long time otherwise the electric cell will get damaged and, The amount of heat produced in a wire due to heating effect. This is the heating effect of the electric currentheating effect of the electric current. This prevents the electric fires. This effect of electric current is called the heating effect of current. Though fluorescent tube lights and CFLs are, initially more expensive to buy (than filament-type bulbs) but their running cost is much less (because they. cannot be seen by us because they are. Electric bulb glows when electric current flows through the filament of the bulb electric fuse in the electric circuit melts when large current flows in the circuit. These, days more and more houses and other buildings are using miniature circuit breakers, (MCBs) to protect the electric wiring from the excessive flow of current. (3)The heating effect of electric current is utilised in a safety device called ‘electric fuse’. Explore more by downloading Electric Current and its Effects Class 7 Notes on BYJU’S. This video is highly rated by Class 7 students and has been viewed 1361 times. We have Provided Electric Current and Its Effects Class 7 Science MCQs Questions with Answers to help students understand the concept … The electric bulb (or electric lamp) which we use for producing light works on the heating effect of electric current. Copper and aluminium metals have very low electrical resistance whereas alloys such as nichrome have very high electrical resistance (Nichrome is an alloy of nickel, chromium, iron and manganese). Author of this website, Mrs Shilpi Nagpal is MSc (Hons, Chemistry) and BSc (Hons, Chemistry) from Delhi University, B.Ed (I. P. University) and has many years of experience in teaching. This heat makes the button of electric. Before buying any electrical appliance, we should look for the ISI mark of the Bureau of Indian Standards on the appliance (ISI stands for Indian Standards Institution). After a few seconds, touch, will feel that the nichrome wire has become hot. 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