सेल के विद्युत वाहक बल और आंतरिक प्रतिरोध से आप क्या समझते हैं इसमें क्या संबंध है? - sel ke vidyut vaahak bal aur aantarik pratirodh se aap kya samajhate hain isamen kya sambandh hai?

Solution : Internal Resistance. The resistance offered by the electrolyte to the flow of etectric current through it is claled the internal resistance of the cell. <br> Electromotive force. The potential difference between the two poles of a cell in an open circuit (when no current is drawn from the cell), is called the e.m.f. of the cell. <br> Due to its e.m.f., a cell drives the charge round the circuit. therefore, e.m.f. of a cell is also defined as the energy supplied by the cell to drive a unit charge round the complete circuit. it is denoted by E. <br> In S.I., the unit of e.m.f. is volt (V) or joule per coulomb `(J" "C^(-1))`. <br> The e.m.f. of a cell is called one volt, if 1 joule of work is performed by the cell to drive one coulomb of charge round the circuit. <br> When the current flows through the cell, its electrolyte offers resistance to the flow of current. <br> Terminal Potential Difference of a Cell <br> The potential difference between the two poles of a cell in a closed circuit (when current is drawn from the cell) is called the terminal potential difference of the cell. It is denoted by V. ,br> When current flows through the circuit, there is fall of potential across the internal resistance of the cell. the potential difference between the two poles of the cell is less than the e.m.f. of the cell by an amount equal to potential drop across the internal resistance. therefore, the terminal potential difference ofa cell is always less than its e.m.f. <br> Relation between e.m.f., potential difference and internal resistance of a cell. <br> (Expression for internal resistance of a cell) <br> Consider the circuit as shown in the figure. <br> <img src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/MBD_EM_PHY_XII_C02_E02_005_S01.png" width="80%"> <br> Insert the key `K_(1) and ` read the voltmeter. it gives the e.m.f. E of the cell. now insert some resistance in the circuit with the help of the resistance box and also close the key `K_(2)` so that the circuit becomes closed. again read the voltmeter. it gives the potential difference between the ends of the external resistance and let it be V. the value of V is smaller than E due to the fall of potential inside the cell. <br> Let r be the internal resistance of the cell and I the current flowing through the circuit when `K_(2)` is closed. Now <br> `I=(E)/(R+r)` <br> or `E=(R+r)I` . . (1) <br> Fall of potential in the external circuit is given by <br> Dividing (1) and (2), <br> `(E)/(V)=(R+r)/(R)=1+(r)/(R)` <br> `(r)/(R)=(E)/(V)-1=(E-V)/(V)` <br> or `r=R((E-V)/(V))=R((E)/(V)-1)` <br> Thus knowing the values of E, V and R, the internal resistance r can be determined.

सेल के विद्युत वाहक बल और आंतरिक प्रतिरोध में क्या संबंध है?

सेल के वैद्युत वाहक बल से क्या तात्पर्य है?

सेल के आंतरिक प्रतिरोध से आप क्या समझते हैं?

सेल का आंतरिक प्रतिरोध से क्या तात्पर्य है किन किन बातों पर निर्भर करता है?