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## what is variable resistance class 10

A variable resistor is a resistor of which the electric resistance value can be adjusted. what is the difference between variable resistance and rheostat - Physics - TopperLearning.com | 9ruvgpyy. Resistance of a conductor is inversely proportional to area of cross section. She has started this educational website with the mindset of spreading Free Education to everyone. 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. Connect wire B between the terminal,note ammeter reading. Answer. The circuit is set out by balancing two legs of a bridge circuit. Science Class 10 Physics (India) Electricity Solving a circuit with series and parallel resistors. Resistance in a conductor depends on nature, length and area of cross section of the conductor. Resistivity of a conductor is defined as resistance of the conductor of unit length and unit area of cross-section. Resistance of second wire is double than 1st wire. A galvanometer with a coil of resistance \$12.0 \Omega\$ shows a full scale deflection for a current of 2.5 mA. 2) Resistance of a conductor is inversely proportional to area of cross section. Example 4: The area of cross section of wire becomes half when its length is stretched to double. For an electron, the journey from terminal to terminal is not a direct route. Lateral Slides. flow of electrons through them. Calculate the ratio of power consumed in the combination of resistors in the two cases. Question 2 How is the resistivity of a material related to the use of that material? Length of conductor: Resistance R is directly proportional to the length of the conductor. The resistance of preset resistor is changed using a … Materials having resistivity in the range of 10−8 Ω m to 10−6 Ω m are considered as very good conductors. They have resistivity in the order of 1012 Ω m to 1017 Ω m. Resistivity of materials varies with temperature. This variable resistance makes resistance bands particularly nice for beginners, those rehabbing from an injury, or who are learning a new exercise and are perfecting form. An electron traveling through the wires and loads of the external circuit encounters resistance. Resistance is a property of conductor due to which it resists the flow of electric current through it. Required fields are marked *. Resistance is the hindrance to the flow of charge. Many domestic appliances use resistance to transfer electrical energy to heat and light energy. 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. 10:00 AM to 7:00 PM IST all days. It is called the electrical resistivity of the material of conductors. (a) Two identical resistors each of resistance 10 ohm are connected: (i) in series (ii) in parallel, in turn to a battery of 6V. Business Enquiry (North) 8356912811. Business Enquiry (South) 8104911739. 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. (b) Establish the relationship between 1 kWh and SI unit of energy. Your email address will not be published. Find the equivalent resistance of the combination. Flow of electrons in a conductor is electric current. Therefore, arrangement B has lower combined resistance. 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. More area of conductor facilitates the flow of electric current through more area and thus decreases the resistance. Resistance of a conductor also depends upon nature of material of conductor,temperature of conductor. Electricity of Class 10 Notes - Complete explanation and Notes of Class 10 Science chapter 1 ‘Electricity’.. Bad conductors are also known as insulators. Solved example: Finding current & voltage in a circuit. 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). This is the cause that thick copper wire creates less resistance to the electric current. Resistance of a wire can be increased or decreased depending on its combinations and connections in a circuit. copper wire (B)=length (l),area of cross section is more than X. 1) Connecting wires in electric circuit are made up of Cu and Al. 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. Contact. 2) Filament of an electric bulb is made up of tungsten metal. Need assistance? 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. Defined simply, a Wheatstone Bridge is an electric circuit that is used to measure the electrical resistance of a circuit. Solution: Given, Resistance ( R ) = 50 Ω, Length ( l ) = 2 m, Hence, radius `= 0.3  mm = 3 xx 10^-4  m`, Now, area of cross section of wire `= π r^2`. Nature of material: Some materials create least hindrance and hence are called good conductors. A variable resistor has a resistance that can be changed. 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. Contact us on below numbers. Variable definition, apt or liable to vary or change; changeable: variable weather;variable moods. Rheostat: This is a device which is used in a circuit to provide variable resistance. 33.A 9Ω resistance is cut into three equal parts and connected in parallel. Variable Resistance Specification. 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. Work your outer thighs as you perform this lateral slide movement. Rather, it is a zigzag path that results from countless collisions with fixed atoms within the conducting material. The particles of conductor create hindrance to flow of electrons; because of attraction between them. Example: Analyzing a more complex resistor circuit. Education Franchise × Contact Us. Various parameters like size, type of track and also resistance is used to define a variable resistance. The classification of this can be done based on two important parameters like Resistance (R-ohms) & Power rating (P-Watts). Example 2: The resistance of an electric wire of an alloy is 10 Ω. A variable resistor is in essence an electro-mechanical transducer and normally works by sliding a contact (wiper) over a resistive element. How the resistance of wire is affected in new condition? Resistivity of a conductor is defined as resistance of the conductor of unit length and unit area of cross-section. Audio frequencies range from about 20 Hz to 20 kHz, so the amplifier must have good frequency response over this range (less when driving a band-limited speaker, such as a woofer or a tweeter). Its Components Combined resistance of arrangement B is caculated as follows: 1/R = 1/10 + 1/1000 = (100+1)/1000. How will you convert the galvanometer into (a) an ammeter of range 0 to 7.5 A, (b) a voltmeter of range 0 to 10.0 V? In practical applications, resistors are used to increase or decrease the electric current. Rheostat: This is a device which is used in a circuit to provide variable resistance. Academic Partner . Last Updated on May 4, 2020 By Mrs Shilpi Nagpal Leave a Comment. It is not changed during normal use of the circuit. The potentiometer resistance otherwise its value mainly decides how much resistance it gives to the current flow. These are used to provide a variable resistance by just changing the knob on the potentiometer. A variable resistor is a type of resistor whose electrical resistance value can be adjusted on demand. Component that is used to resist the flow of electric current in a circuit is called resistor. Such materials are called bad conductors. Conductor The movement of electron gives rise to the flow of current through metals Resistance of a conductor is inversely proportional to area of cross section Resistance of a conductor also depends upon nature of material of conductor,temperature of conductor. 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. Reading of ammeter in second case is more that of reading in 1st case. While the electric potential difference established between the two terminals encourages the movement of charg… Usually, the spindle diameter of a variable resistor is 6mm. … A fixed resistor has a resistance that remains the same. Question 5 Why Filament of an electric bulb is made up of tungsten metal? 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