The classification of this can be done based on two important parameters like Resistance (R-ohms) & Power rating (P-Watts). For an electron, the journey from terminal to terminal is not a direct route. Melting point is high or does not burn at higher temperature. S.I. Contact. Reading of ammeter in second case is half that of reading in 1st case. Determine the net resistance of the metre in each case. Resistance in a conductor depends on nature, length and area of cross section of the conductor. Resistivity, commonly symbolized by the Greek letter rho, ρ, is quantitatively equal to the resistance R of a specimen such as a wire, multiplied by its cross-sectional area A, and divided by its length l; ρ = RA/l.The unit of resistance is the ohm.In the metre-kilogram-second (mks) system, the ratio of area in square metres to length in metres simplifies to just metres. Variable definition, apt or liable to vary or change; changeable: variable weather;variable moods. Stand on the center of a resistance band and hold the ends in each hand, pulling the band taut. 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. Example 4: The area of cross section of wire becomes half when its length is stretched to double. A fixed resistor has a resistance that remains the same. Component that is used to resist the flow of electric current in a circuit is called resistor. (b) Establish the relationship between 1 kWh and SI unit of energy. a)Resistivity of Cu and Al is low(act as a good conductor). The resistance of preset resistor is changed using a … 1) Connecting wires in electric circuit are made up of Cu and Al. Lateral Slides. 1800-212-7858 / 9372462318. Solution: Let the area of cross section of wire = A. Length of conductor: Resistance R is directly proportional to the length of the conductor. 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. If the thickness of wire is 0.001 meter, and length is 1 m, find its resistivity. So, new resistance is (1/16)th of original resistance. Question 2 How is the resistivity of a material related to the use of that material? Usually, the spindle diameter of a variable resistor is 6mm. The SI unit of resistivity: Since, the SI unit of R is Ω, SI unit of Area is m2 and SI unit of length is m. Hence, Unit of resistivity (ρ) `=(Ωxxm^2)/(m)=Ωm`. 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. Conductor The movement of electron gives rise to the flow of current through metals 10:00 AM to 7:00 PM IST all days. completion of all the aspects of the stages that apply to the final stage of a class 10 building or structure). Nature of material: Some materials create least hindrance and hence are called good conductors. Full-Body Resistance Band Workout 1. If the variable resistor has a straight track it is defined in the component by the short form LIN representing a linear track. A variable resistor has a resistance that can be changed. Various parameters like size, type of track and also resistance is used to define a variable resistance. Its Components (a) Two identical resistors each of resistance 10 ohm are connected: (i) in series (ii) in parallel, in turn to a battery of 6V. Materials having resistivity in the range of 10−8 Ω m to 10−6 Ω m are considered as very good conductors. Resistance of second wire is double than 1st wire. Resistivity of a conductor is defined as resistance of the conductor of unit length and unit area of cross-section. 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. Resistivity does not depend on l and A but on nature of material of which substance is made of. How the resistance of wire is affected in new condition? Education Franchise × Contact Us. Your email address will not be published. They have resistivity in the order of 1012 Ω m to 1017 Ω m. Resistivity of materials varies with temperature. This means, Resistance increases with increase in length of the conductor. Resistance of arrangement A is 10 ohm. This means R will decrease with increase in the area of conductor and vice versa. They are set at a particular value Variable Resistances: Their resistance can be easily changed by changing area of cross section and length 30. flow of electrons through them. Solution: Given, Resistivity (ρ) = 10 x 10−8 Ω m, Length ( l ) = 2 m, Diameter = 0.3 mm, Now, Radius of wire `= text(Diameter)/(2) = (0.3 mm) / (2) = 0.15 mm = 1.5 xx 10^-5 m`, Or, `R=(10xx10^-8Ω\xx2m)/(7.65xx10^-9m^2)`. Need assistance? The Lifeline Variable Resistance Training Kit is reviewed favorably on Amazon, but it disappointed us. Resistance is a property of conductor due to which it resists the flow of electric current through it. Bad conductors are also known as insulators. 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. Combined resistance of arrangement B is caculated as follows: 1/R = 1/10 + 1/1000 = (100+1)/1000. Required fields are marked *. Where ρ (rho) is the proportionality constant. While the electric potential difference established between the two terminals encourages the movement of charg… Business Enquiry (North) 8356912811. Business Enquiry (South) 8104911739. Question 5 Why Filament of an electric bulb is made up of tungsten metal? Question 4 Why connecting wires in an electric circuit are made of Cu and Al? Variable definition: Something that is variable changes quite often, and there usually seems to be no fixed... | Meaning, pronunciation, translations and examples Electricity of Class 10 Notes - Complete explanation and Notes of Class 10 Science chapter 1 ‘Electricity’.. 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. The electrons encounter resistance - a hindrance to their movement. Electricity of Class 10 Notes, Electricity Class 10 Solutions, Explanation, NCERT Solutions. 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. Aim Experiment To determine the equivalent resistance of two resistors when connected in series. Hard plastic is the one of the best insulators of electricity. A resistor network that is a combination of parallel and series connections can be broken up into smaller parts that are either one or the other. Therefore, arrangement B has lower combined resistance. 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. Science Class 10 Physics (India) Electricity Solving a circuit with series and parallel resistors. As current is passed through the metal element in this kettle, resistance causes the metal to get hot and so boils the water. The circuit is set out by balancing two legs of a bridge circuit. Resistivity of a conductor is defined as resistance of the conductor of unit length and unit area of cross-section. 4) Insulators are used to protect ourselves from severe shock of electric current. The potentiometer resistance otherwise its value mainly decides how much resistance it gives to the current flow. Calculate the ratio of power consumed in the combination of resistors in the two cases. A variable resistor is a type of resistor whose electrical resistance value can be adjusted on demand. A variable resistor is a resistor of which the electric resistance value can be adjusted. … This hindrance is the cause of resistance in the flow of electricity. Reading of ammeter in second case is more that of reading in 1st case. A galvanometer with a coil of resistance $12.0 \Omega$ shows a full scale deflection for a current of 2.5 mA. Filed Under: Class 10, Electricity Tagged With: area of cross section, cause of resistance, connecting wires, filament of an electric bulb, length, nichrome, resistance, resistivity. Also known as a Potmeter or Pot, it consists of a resistive element called the track and a sliding contact called the wiper internally where end terminals are attached to the resistive element. 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