Your email address will not be published. These are used to provide a variable resistance by just changing the knob on the potentiometer. (b) Calculate the resistance of an aluminium cable of length 10 km and diameter 2.0 mm if the resistivity of aluminium is 2.7 x 10-8 Ωm. A fixed resistor has a resistance that remains the same. A variable resistor is a type of resistor whose electrical resistance value can be adjusted on demand. Variable definition: Something that is variable changes quite often, and there usually seems to be no fixed... | Meaning, pronunciation, translations and examples Example 1: What will be the resistivity of a metal wire of 2 m length and 0.6 mm in diameter, if the resistance of the wire is 50 Ω. For an electron, the journey from terminal to terminal is not a direct route. Resistance is the hindrance to the flow of charge. Electricity of Class 10 Notes - Complete explanation and Notes of Class 10 Science chapter 1 ‘Electricity’.. 1800-212-7858 / 9372462318. Solution: Given, Resistance ( R ) = 10 Ω, Length ( l ) = 1 m. Example 3: The resistivity of a metal wire is 10 x 10−8 Ω m at 20°C. Area of cross section: Resistance R is inversely proportional to the area of cross section ( A) of the conductor. The potentiometer resistance otherwise its value mainly decides how much resistance it gives to the current flow. A variable resistor is in essence an electro-mechanical transducer and normally works by sliding a contact (wiper) over a resistive element. Hard plastic is the one of the best insulators of electricity. Solved example: Finding current & voltage in a circuit. The electrons encounter resistance - a hindrance to their movement. For Example: Silver has lowest resistivity and is the best conductor. Various parameters like size, type of track and also resistance is used to define a variable resistance. Required fields are marked *. Flow of electrons in a conductor is electric current. Electricity of Class 10 Notes, Electricity Class 10 Solutions, Explanation, NCERT Solutions. Resistance of a conductor is inversely proportional to area of cross section. Practice: Simplifying resistor networks. Resistance training is based on the principle that muscles of the body will work to overcome a resistance force when they are required to do so. Definition of Variable Resistor It is an electronic component. How the resistance of wire is affected in new condition? Education Franchise × Contact Us. Class 10 building or structure or alteration (including addition) to a class 10 building or structure (except a swimming pool) A notice for inspection must be given by the builder to the building certifier for any stages on the development approval and the final stage (i.e. The resistance of preset resistor is changed using a … The Lifeline Variable Resistance Training Kit is reviewed favorably on Amazon, but it disappointed us. Your email address will not be published. Contact. Variable Resistance: The component of an electric circuit which is used to regulate the current; without changing the voltage from the source; is called variable resistance. … Conductor The movement of electron gives rise to the flow of current through metals They have resistivity in the order of 1012 Ω m to 1017 Ω m. Resistivity of materials varies with temperature. Its Components Resistance of second wire is double than 1st wire. Electric Circuit and 10. Resistance in a conductor depends on nature, length and area of cross section of the conductor. 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. She has started this educational website with the mindset of spreading Free Education to everyone. Example 2: The resistance of an electric wire of an alloy is 10 Ω. Factors on which resistance of a conductor depends: 1) Resistance of a conductor is directly proportional to length. 33.A 9Ω resistance is cut into three equal parts and connected in parallel. Answer. 1) Connecting wires in electric circuit are made up of Cu and Al. Melting point is high or does not burn at higher temperature. Resistance training (also called strength training or weight training) is the use of resistance to muscular contraction to build the strength, anaerobic endurance and size of skeletal muscles. Resistors are joined in the circuit in two different methods, i.e., in series and in parallel. Calculate the ratio of power consumed in the combination of resistors in the two cases. Class Variable: A class variable is an important part of object-oriented programming (OOP) that defines a specific attribute or property for a class and may be referred to as a member variable or static member variable. A meter-long piece of large-diameter copper wire may have a resistance of 10 −5 Ω, and superconductors have no resistance at all (they are non-ohmic). Silver has resistivity equal to 1.60 X 10−8 Ω m and copper has resistivity equal to 1.62 X 10−8 Ω m. Rubber and glass are very good insulators. Solution : (a) If we take two similar wires of same length and same diameter, one of copper metal and other of nichrome alloy, we will find that the resistance of nichrome wire is about 60 times more than that of the copper wire. 33.A 9Ω resistance what is variable resistance class 10 a zigzag path that results from countless collisions with fixed atoms within the material. Arrangement B is caculated as follows: 1/R = 1/10 + 1/1000 = ( 100+1 ) /1000 fixed resistors resistance... Explanation and Notes of Class 10 Science Electricity Short Answer type Questions [ ]... Of ammeter in second case is half that of reading in 1st case hindrance in the order 1012! Center of a conductor depends: 1 ) connecting wires in electric are! To area of cross section of wire is redrawn by pulling it until its is. In Practical applications, resistors are joined in the flow of charge [ 2 Marks ] – 2011! = 1/10 + 1/1000 = ( 100+1 ) /1000 of Class 10 Science chapter 1 Electricity! 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