heating effect of electric current class 7

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.) MCQ Questions for Class 7 Science with Answers were prepared based on the latest exam pattern. Q13. The metal caps are for connecting the fuse in the circuit in a suitably made bracket. The hot electric iron is then used for ironing clothes. These days MCBs (miniature circuit breakers) are being used increasingly in household electrical switch in place of traditional fuses. The electric room heater (called convector) has an element made of a coil of nichrome wire.When current is switched on in an electric room heater after connecting to a socket of power supply line, the element (or coil) of heater becomes red-hot and gives out heat. We should always use proper fuses (carrying ISI mark) which have been specified for particular applications. Electric Current and Its Effects Class 7 Science Extra Questions Short Answer Type Questions. 1)Electric heater,iron,water heater work on heating effect of current. Here we have given NCERT Class 7 Science Notes Chapter 14 Electric Current and Its Effects. Question 8 When does the overloading of a household electric circuit occur? Activity 14.6 You can also find Heating Effects of Electric Current Class 7 Video | EduRev ppt and other Class 7 slides as well. An electric current is passing through a conductor which becomes hot after some time and produces heat. The glass tube has two metal caps at its two ends. Heating Effect of Electric Current; Electric Current and its Effects. So, the filament-type electric bulbs are not. 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). What are the uses of heating effect of electric current? The glass tube has two metal caps at its two ends. The part of electric heating appliance which ‘heats up’ on passing current is called heating element of the appliance. in place of traditional fuses. Practical application of heating effect of current. 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. Heating effect of the current is defined as, the heating of wire due to the flow of electric current through it. This is known as overloading.The flow of large current due to overloading may heat the copper wires of household wiring to a high temperature and a fire may be started. Appliances which require heating effect have conductors or the heating elements. Check the below NCERT MCQ Questions for Class 7 Science Chapter 14 Electric Current and Its Effects with Answers Pdf free download. 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). Greater the magnitude of current passed through a given wire, greater will be the heat produced in it. 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. The ISI mark ensures that the. A fuse is a safety device which prevents electric fires and damage to electrical a. Question 1 What is meant by heating effect of current? Can you list these effects? This prevents the electric fires. Visit www.learnfatafat.com for more. Heating Effects of Current. When electric current is passed through a conductor, it generates heat due to the resistance it offers to the current flow. 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. There is a maximum limit on the current which can flow safely through the fuse wire inserted in the household circuit. All the electric heating appliances contain coils of high resistance wire made of alloy. about 10 centimetre long piece of nichrome wire and tie it between the two nails. 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). An electric current can produce three effects: The degree to which a material opposes the passage of current through itself is called its resistance. 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. A short wire has less resistance whereas a long wire has more resistance. Explore more by downloading Electric Current and its Effects Class 7 Notes on BYJU’S. An electric fuse is used to ‘make’ or ‘break’ an electric circuit. A fuse consists of a short length of a thin, tin-plated copper wire having low melting point. One insulated wire is called live wire and the other insulated wire is called neutral wire. (1) Take two iron nails and fix them some distance apart on a thermocol sheet (or a wooden block) . filament of an electric bulb has a high resistance. 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. Your email address will not be published. For example : Copper has a very low resistance, so if electric current is passed through a copper wire, then the heat produced in it will be extremely small (due to which the copper wire will become negligibly hot). Different factors affect these benefits such as … (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. When electric current is passed through an electric heating appliance by connecting it to a power socket through insulated copper wires (called cord’ or ‘connecting cable’), then a large amount of heat is produced in the heating element (or coil) due to which the heating element become red-hot. This heat makes the button of electric. 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. 2. This will protect the appliance from damage which could have been caused if the large current had passed through it. This video is highly rated by Class 7 students and has been viewed 1041 times. Fig. very high electrical resistance (Nichrome is an alloy of nickel, chromium, iron and manganese). (3)The heating effect of electric current is utilised in a safety device called ‘electric fuse’ Electric Heating Appliances. 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. e hot electric iron is then used for ironing clothes. The electric iron works on the basis of heating effect of electric current. Heating elements have high melting point so that they do not get damaged due to the heat generated. This is called the heating effect of current. A fuse consists of a short length of a thin, tin-plated copper wire having low melting point. (a) Battery, (b) Switch 3. The large current flowing through. This property is called a heating effect of an electric current. When a switch is in OFF position, (i) circuit starting from the positive terminal of the cell stops at the … 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. We use a thin wire in a fuse because it has a much greater resistance than the rest of connecting wires. Watch Heating Effect Of Electric Current Class 7 Science Chapter 14 Electric Current And Its Effects. All the electric heating appliances contain coils of high resistance wire made of alloy. The ISI mark ensures that the appliance is safe and energy efficient (the wastage of energy being the minimum). Who invented electric bulb? to which the heat produced in them is negligible). A lot of 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. (2) Magnitude of current passed through the wire. So, when the current, in a household circuit suddenly increases too much, then, the thin fuse wire gets heated too much, melts and breaks, the circuit (due to which current stops flowing in the, circuit). want Heating Effects of Electric Current Class 7 Video | EduRev notes & Videos, you can search for the same too. Also, a thick wire has less resistance whereas a thin wire has more resistance. The bar acts like a magnet when around an iron bar electric current runs through a wire. This is called the heating effect of electric current. of this page. power efficient (because they waste a lot of electricity as heat). The wastage of electricity can be reduced by, Advantage of Compact Fluorescent lamps (CFLs), and Compact fluorescent lamps do not have, filaments. MCB does not work on the heating effect of current. (Do not hold it for a long time.) When a short circuit or overloading occurs, the fuse wire blows out cutting off the electricity supply. 2)Directly proportional to resistance of conductor. Question 5 Why any metal wire or metal strip cannot be used in place of fuse wire? When an electric current flows through a conducting solution, does it produce an effect on the solution? It has gotten 1371 views and also has 4.8 rating. The production of heat by an electric bulb is not desirable because it leads to the wastage of electricity. Ques 3: Write two special characteristics of the wire needed for making the ‘element’ of an electric heater. The touching of live wire and neutral directly is known as short circuit. Figure 7: Different types of Fuses An electric fuse is a device that is used to prevent the damage that can be caused by an excess of electric current. electrical appliances such as TV and refrigerator could also damage them. Economics Chapter 2 Sectors of the Indian Economy – Notes & Study Material, Economics Chapter 1 Development – Notes & Study Material, Geography Chapter 6 Manufacturing Industries – Notes & Study Material. (4) Now pass the electric current in the circuit by moving the switch to ‘on’ position (by closing the gap). The nichrome wire has become hot because the electric current passing through it has produced heat in it. She has started this educational website with the mindset of spreading Free Education to everyone. 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). contains mercury vapour. Electric Circuit. (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. 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. This is called heating effect of electric current. When the fuse grip carrying fuse wire is inserted in the fuse holder, then the circuit of household wiring is completed. concealed inside the body of these appliances. Join Don't Memorise & avail access to all videos for a year. Thank you it helps me a lot…. The metal caps are for connecting the fuse in the circuit in a suitably made, bracket. I’m a nuthead when it comes to electricity, but after reading your article, I’m sure I will be able to understand this subject more readily. Electric fuses are inserted in the wiring (or circuits) of all the houses and other buildings. The magnetic effect of electric current. Required fields are marked *, The degree to which a material opposes the passage of current through itself is called its, Copper and aluminium metals have very low electrical resistance whereas alloys such as nichrome have. Answer: NCERT solutions for … cannot be seen by us because they are concealed inside the body of these appliances. The thin fuse wire has a much greater resistance than the rest of the electric wiring in the house. 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. When an electric current is passed through a high resistance wire (like nichrome wire), the resistance wire becomes hot and produces heat. These days MCBs, (miniature circuit breakers) are being used increasingly in household electrical switch. MCB works on the magnetic effect of 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). 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… books of Class 7. 14.10 seconds touch the wire. Chemical Effects of Electric Current Class 8 MCQs Questions with Answers. When the MCB is re-set, the circuit becomes complete and electric current starts flowing in the household wiring again. Electric Bulb: The filament of the bulb gets heated up when electricity is passed through the bulb. Thus, nichrome wire is resistance wire. MCB stands for Miniature Circuit Breaker. This type of circuit is called a Closed Circuit. Activity - Make an electric circuit as shown in the figure. Get class 7 science videos of chapter electric current & its effects. 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. These days more and more houses and other buildings are using miniature circuit breakers to be replaced (MCBs) to protect the electric wiring from the excessive flow of current. Electric Bulb: Electric bulb consists of a filament. Fuses are also used to protect the individual domestic electrical appliances from damage which may be caused due to excessive current flow through them. A fluorescent tube light (or lamp) contains mercury vapour. Question 2 Name few appliances which work on heating effect of current? Take a 10 cm long nichrome wire and tie it between the two nails. (3) Make an electric circuit by connecting the two nails to the two terminals of. This is due to the conversion of some of the electrical energy that passes through the conductor, into heat energy. Applications of Heating Effect of Electric Current, RD Sharma Solutions for Class 7 Mathematics. I really loved the way you explained the complicated subject in a clear and simple way. Question 6 When does an electric short circuit occur? Open electric circuit. The electric heating appliances (such as electric room heater, electric iron, etc.) This is the heating effect of the electric currentheating effect of the electric current. MCB works on the magnetic effect of current. Question 3 Explain why filament type electric bulb are not power efficient? Make a list of such appliances. Also, a thick wire has less resistance whereas a thin wire has more resistance. So, when the current in a household circuit suddenly increases too much, then the thin fuse wire gets heated too much, melts and breaks the circuit (due to which current stops flowing in the circuit). 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. of chapter in the best manner. Last Updated on March 20, 2019 By Mrs Shilpi Nagpal 3 Comments. Heating elements. 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. This is the heating effect of the electric current. When an electric current passes through a high resistance wire, the electric energy gets converted into heat energy.This heat energy heats up the resistance wire. Filed Under: Class 7, Electric Current and its Effects, Science. Higher the resistance, the electric current will generate higher amount of heat. A fuse works on the heating effect of current. A small current passing in a wire produces less heat but a large current passing through the same wire produces much more heat. Q12. In household electric wiring, electric current is supplied through two insulated wires, which run together and reach each and every electrical appliance. Heating Effect of Electric Current. Greater the magnitude of current passed through a given wire, greater will be the heat produced in it. According to the heating effect of the electric current, a wire becomes hot as current is passed through it. Question 10 Explain the working of Electric room heater? If not, you may try it out now.Paheli and Boojho had also set up the game by connecting an electric circuit as suggested in Class VI. So, the filament-type electric bulbs are not power efficient (because they waste a lot of electricity as heat).The wastage of electricity can be reduced by using fluorescent tube lights and Compact Fluorescent lamps (CFLs) for producing light (in place of filament-type electric bulbs. What effect does the current produce when it flows through a conducting solution? (3) Make an electric circuit by connecting the two nails to the two terminals of cell through a switch by using copper wires. large current flows through the household wiring. Heating elements have wire coils which produce heat. You might have tried the game How steady is your hand?’suggested in Chapter 12 of Class VI. The fuse consists of a porcelain fuse holder and a removable porcelain fuse grip.The fuse holder is connected in the household circuit The fuse grip has a fuse wire fixed in it. The values showed by Pinki here is a great concern and love towards her own 4 years old daughter. When a fuse gets blown (or breaks), a new fuse has to be fitted in its place to restore the electricity, connecting wires. extremely large current from the household circuit. Due to its high resistance, the heating effect of current will be much more in the fuse wire than anywhere else in the circuit. 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). The fuses used in individual electrical appliances are called, MCB stands for Miniature Circuit Breaker. This will. This is the heating effect of current. (1) The fluorescent tube lights and Compact fluorescent lamps do not have filaments. It consists of a glass tube having a thin fuse wire sealed inside it. Q1: Draw in your notebook the symbols to represent the following components of electrical circuits: … Such connecting cables should be replaced immediately, When too many electrical appliances are connected to a single socket, they draw an. work on the heating effect of current. is produced in the connecting wires of copper because copper has very low resistance. 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. MCQ Questions for Class 7 Science: Ch 14 Electric Current and Its effects. The thin, fuse wire has a much greater resistance than the rest of the electric wiring in the house. When, a short circuit or overloading occurs, the fuse wire blows out cutting off the electricity supply. A wire made of a material having high electrical resistance is called a resistance wire. become very hot or red-hot on passing electric current because they have very high resistance (due to which the heat produced in them is very large). EduRev by using search above. (3)The heating effect of electric current is utilised in a safety device called ‘electric fuse’. When a house or some other building is wired, the wiring is protected by fuses. When the MCB is re-set, the circuit becomes, complete and electric current starts flowing in the household wiring again. is called heating element of the appliance. When the live wire and neutral wire touch each other directly, then large current flows through the household wiring. When current is switched on in an electric room heater after connecting to a socket of power supply, line, the element (or coil) of heater becomes red-hot and gives out heat. Rated by Class 7 Video | EduRev is made by best teachers of Class 7 Video | EduRev Questions. 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