The electrical resistance of an object refers to the measure of its opposition to the flow of electric current. Write relation between heat energy produced in a conductor when a potential difference V is applied across its terminals and a current I flows through for ‘t’. If the resistance braze generates large amounts of heat for a long time. Resistance is the property of a conductor, which determines the quantity of current that passes through it when a potential difference is applied across it. Class 10. The unit of electrical resistance is ohm which is defined as volt per ampere. 2. I have seen some over one minute long.) 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Question 1. Check you answers with answer keys provided. All the questions are divided into 1 mark, 2 marks, 3 marks and 5 marks questions. 1. Resistance is the opposition that a substance offers to the flow of electric current.It is represented by the uppercase letter R. The standard unit of resistance is the ohm, sometimes written out as a word, and sometimes symbolized by the uppercase Greek letter omega: . I have seen some over one minute long.) Physics. Sep 02,2020 - If a wire is increased by 20% .what is resistance? When a 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit. Why are copper and aluminium wires usually employed for electricity … Class 10 Science Home Page. Tungsten has low resistivity,does not burn even at higher temperature(melting point is very high), 3) Heating elements of electrical appliances like electric iron,heater,toaster,immersion rod are made of nichrome (alloy of Ni,Cr,Fe,Mn). 4) Insulators are used to protect ourselves from severe shock of electric current. Resistance of a conductor is inversely proportional to area of cross sectionÂ. The resistance of a System of Resistors. Class 10 Current Electricity Short Answer Questions TOPIC-2 Combination of resistors (Series and Parallel combination), the heating effect of electric current and electric power. When connected in series, the value becomes 9 Ω. Q33. | EduRev Class 10 Question is disucussed on EduRev Study Group by 195 Class 10 Students. Electric resistivity is defined as the electrical resistance offered per unit length and unit cross-sectional area at a specific temperature and is denoted by ρ. Q7. 9 min. The electrical resistivity of silver is 1.60 × 10-6 Ω m. What will be the resistance of a silver wire of length 10 m and cross-sectional area 2 × 10-3 m2? ICSE Class 10. What is Resistance? unit of charge is coulomb. What is Resistance? Resistance of uniform metallic conductor is directly proportional to its length and inversely proportional to area of … NCERT Solutions for Class 10 Science Electricity. Answer: Given: p = 1.60 × 10-6 Ω m, l = 10 m and A = 2 x 10-3 m 2 Resistance, Question 22. Sep 30,2020 - What is a resistance? Class 10 Resistance of a System of Resistors. Resistivity of a conductor is defined as resistance of the conductor of unit length and unit area of cross-section. The distance of image from the mirror is (a) -30 cm (b) 30 cm (c) 10 cm (d) -10 cm. Therefore, resistivity is proportional to the cross-sectional area. Q2.What happens to the resistivity if resistance and length are constant and the cross-sectional area is doubled? Copper wire(A)= length(l) , area of cross section X, copper wire (B)=length (l),area of cross section X. Connect wire A between the terminal,note ammeter reading. The reason behind this is the electron movement from the conduction band to the valence band increases as the energy gap between these two bands is large. Electrical resistance is defined as the property of an electrical component to resist the flow of electric current. unit of resistance is ohm. An object is placed at a distance of 10 cm in front of a concave mirror. According to Ohm’s law, there is a relation between the current flowing through a conductor and the potential difference across it. The unit of electrical resistance is ohms. If you have any query regarding Rajasthan Board RBSE Class 10 Science Solutions Chapter 10 Electricity Current, drop a comment below and we will get back to you at the earliest. where ρ is the resistivity of the material (measured in Ωm, ohm meter). See more. But there is a very basic difference between resistance and resistivity. PREVIOUS NEXT. In these sections, we discussed … Given below are the Class 10 Science Solved Numerical Questions for electricity a. Concepts questions b. Calculation/Numerical problems c. Multiple choice questions d. Long answer questions e. Fill in the blanks Question 1 A wire of length 3 m and area of cross-section 1.7 × 10-6 m 2 has a resistance 3 × 10-2 ohm. The resistance class is composed by two numbers, divided by a dot. Understand the various factors affecting the resistance by watching the video below. Resistance of a conductor depends: On its length; On its area of cross-section; On the nature of its material . When an electric current of one ampere passes through a … (ii) Only diameter of the wire is doubled? Slope indicates Resistance ∴ Resistance of the resistor = 3.4Ω. Reading of ammeter in second case is more that of reading in 1st case. Hence, length of the wire, If the diameter of the wire is doubled, new diameter . When two or more resistors are connected in series: The current through the circuit remains the same. It is given by the following relation. These questions are useful for CBSE Board Examination preparation and practicing to class tests. You also read about the factors which affect the resistance of a conducting wire. Overview. Ans: As we know that \(\rho =\frac{E}{J}\), therefore by doubling the cross-sectional area, resistance can be decreased by a factor of 2. a. What happens to the resistance of insulators with an increase in temperature? Required fields are marked *, Electric charge flows easily through some materials than others. Class. The current flow increases, the resistance acts as a speed breaker to the accelerated car (high current flow). The two 10 resistors are connected in series and they are parallel to the 5 resistor.The equivalent resistance, Subject. You also read about the factors which affect the resistance of a conducting wire. Resistivity does not depend on l and A but on nature of material of which substance is made of. In the next few sections, let us study electrical resistance in detail. 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. She has started this educational website with the mindset of spreading Free Education to everyone. Ans: The unit of resistivity is given as Ohm-metre. Melting point is high or does not burn at higher temperature. 6 min. Economics Chapter 4 Globalisation and The Indian Economy – Notes & Study Material, वाक्य और वाक्य के भेद, Economics Chapter 3 Money and Credit – Notes & Study Material, Compounds of Xenon and uses of Noble Gases, Characteristics and Physical Properties of Group 18 Elements, Oxoacids of Halogens and Interhalogen Compounds, English Alphabets with Phonics Pronunciation. How much does the resistance change if the diameter is doubled? Class 10 Physics Electricity: Resistors in series: Resistors in series. a)Resistivity of Cu and Al is low(act as a good conductor). Since A is doubled, keeping resistance and length constant, resistivity will also be doubled. ... A current of 2 A passes through a conductor and produces 80 joules of heat in 10 seconds. What is effective resistance? Ans: As the temperature increases, the resistance of pure metals increase. (c) S.I. The time will be 1/10 hr. A conductor has large number of free electrons.When a potential difference is maintained across the ends of conductor,the free electrons move from one end to other end.During their movement,they collide with each other and with atoms of conductor.These collision opposes the movement of electrons from one end to other end.This opposition to the flow of electrons … Q. We hope the given RBSE Solutions for Class 10 Science Chapter 10 Electricity Current will help you. The inverse quantity refers to the electrical conductance. Overview. If the resistance braze generates large amounts of heat for a long time. Q1. The Questions and Materials having resistivity in the range of 10 −8 Ω m to 10 … Il primo corrisponde al carico di rottura nominale diviso 100, mentre il secondo è il rapporto tra il carico di snervamento e il carico di rottura, moltiplicato per 10. A resistor is a electrical componet with a predetermined electrical resistance, like 1 ohm, 10 ohms 100 ohms 10000 ohms etc. It forms a real image three times larger than the object. Resistance of a conductor also depends upon nature of material of conductor,temperature of conductor. Following is the formula of electrical resistivity: Interested to learn more about the difference, below is the link: Difference Between Resistance and Resistivity. 9 min. The higher the temperature the higher is the resistance. Electricity Class 10 Important Questions Short Answer Type II. 6 min. Find the equivalent resistance of the combination. Resistance and Resistivity. Two resistance when connected in parallel give resultant value of 2 Ω. Factors on which resistance of a conductor depends: 1) Resistance of a conductor is directly proportional to length. KSEEB SSLC Class 10 Science Solutions Chapter 12 Electricity are part of KSEEB SSLC Class 10 Science Solutions. The resistance of a System of Resistors. Calculate the value of each resistance. Factors Affecting Resistance. So, R 1 = R 2 = 5 ohm, form a parallel loop. Your email address will not be published.

Offered for classes 6-12, LearnNext is a popular self-learning solution for students who strive for excellence. Resistance increases and hence less electricity can pass through it Note - This is the reason that we use thick wire to carry more electrical load (as thick wire has more area of cross section and offers less resistance and more electricity can pass through it ) Nature of Material Resistance also depends on the nature of the … Resistance (R) of a copper wire of length l and cross-section A is given by the expression, Where, Resistivity of copper, Area of cross-section of the wire, A = Diameter= 0.5 mm = 0.0005 m. Resistance, R = 10 Ω. | EduRev Class 10 Question is disucussed on EduRev Study Group by 189 Class 10 Students. NCERT Solutions for Class 10 Science Electricity Questions and Answers Intext Questions Page Number - 200 Q1. Resistance and Resistivity. How can we decrease the resistance of a wire by a factor of 2? Resistance refers to a measure of the opposition to current flow in a particular electrical circuit. Question 1 A piece of wire is redrawn  by pulling it until its length is doubles.Compare the new resistance with the original value? Last Updated on May 4, 2020 By Mrs Shilpi Nagpal Leave a Comment. Q8. HUMAN EYE AND THE COLOURFUL WORLD. The resistivities of a few materials are given below for a comparison. unit of current is ampere. therefore by solving for resistivity we get. 2) Filament of an electric bulb is made up of tungsten metal. class 2: LIMITED RESISTANCE The materials belonging to this class … Class. Therefore, resistance Materials with a low value of resistivity conduct electricity very well. PREVIOUS NEXT. Required fields are marked *. Class-10 Goyal Brothers Electric Circuit, Resistance and Ohm’s Law ICSE Physics Solutions Ch-8 .We Provide Step by Step Answer of Exercise, MCQs, Numerical Problem Questions of Exercise-1 Goyal Brothers Electric Circuit, Resistance and Ohm’s Law ICSE Class-10 .Visit official Website CISCE for detail information about ICSE Board Class-10 … Resistor is defined as The main purpose of resistor is to reduce the current flow and to lower the voltage in any particular portion of the circuit. In this video, I have explained about the resistance in the electric circuits in depth from chapter-12 class 10 … Resistance has an application in protecting the circuit from high current flow. unit of charge … Factors Affecting Resistance. In these sections, we discussed simple circuits. Learn more about other related concepts with the help of engaging video lessons by visiting BYJU’S, Your email address will not be published. Disadvantages of series arrangement of resistors. There is a belief among some circles that 'it's easy to take a basic shed and convert to to a house or granny flat and this makes it a cheaper way to build'. Therefore, conductance increases and the resistance decreases. copper wire (B)=length (l),area of cross section is more than X. | CBSE Class 10 Science | Chapter12 | Electricity | By Shruti Academy In this video, I have explained about the resistance in the electric circuits in depth from chapter-12 class 10 CBSE NCERT. A conductor has large number of free electrons.When a potential difference is maintained across the ends of conductor,the free electrons move from one end to other end.During their movement,they collide with each other and with atoms of conductor.These collision opposes the movement of electrons  from one end to other end.This opposition to the flow of electrons due to collision is the resistance.More the collision suffered by electron in a conductor,more is the resistance. (Some resistance brazes are 10 - 20 seconds or longer - not cycles.

The unit of resistivity is ohm-meter (Ω-m). Ans. [CBSE 2010] Ans. It is given by. Q1. The resistance, R of the eureka wire is the highest whereas the resistance, R of the copper wire is the lowest. Class 10. Equivalent series resistance between A and B, R, = 2+2 = 4 Ω In series combination. What happens to the resistance of pure metals with an increase in temperature? Learn Videos. Your email address will not be published. The electrical resistance measures how much the flow of this, Difference Between Resistance And Resistivity. The first corresponds to the nominal Question 2 How is the resistivity of a material related to the use of that material? Resistance is a property of conductor due to which it resists the flow of electric current through it. The two 10 resistors are connected in series and they are parallel to the 5 resistor.The equivalent resistance, Subject. Then effective resistance, Q. Connect wire B between the terminal,note ammeter reading. Filed Under: Class 10, Electricity Tagged With: resistance, resistors are connected in series, series arrangement of resistors About Mrs Shilpi Nagpal 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 … Resistance. Q3. 2) Resistance of a conductor is inversely proportional to area of cross section. Class 10 Science Chapter 12 Extra Questions and Answers Electricity. Resistance (R) of a copper wire of length l and cross-section A is given by the expression, Where, Resistivity of copper, Area of cross-section of the wire, A = Diameter= 0.5 mm = 0.0005 m. Resistance, R = 10 Ω. What ... What will be the length of this wire to make its resistance 10 Ω? Practice to excel and get familiar with the paper pattern and the type of questions. Resistors in series. 33.A 9Ω resistance is cut into three equal parts and connected in parallel. The electrodes can get very hot. The electrodes can get very hot. Resistance is a measure of how much a component or material resists the flow of electricity through it, measured in ohms. It is made of copper wires which is coiled around a ceramic rod and the outer part of the resistor is coated with an insulating paint. Calculating the effective resistance/total resistance of series circuits: The total resistance/effective resistance of the circuit is found by simply adding up the resistance values of the individual .

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