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The internal resistance of an accumulato...

The internal resistance of an accumulator battery of emf 6V is `10(Omega)`when it is fully discharged,As the battery gets charged up.its internal resistance decreases to `1(Omega)`The battery in its completely discharged state is connected to a charger which maintains a constant potential difference of 9 V.Find the current through the battery (a)just after the connections are made and (b) after a long time when it is completely charged.

Text Solution

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(a) Net e.m.f. while charging
` = 9-6 = 3v`
` :. Current = 3/10 = 0.3A `
(b)When completely charged internal
resistance 'r' = `1 Omega `
` So, Current = 3/1 = 3A.`
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HC VERMA-ELECTRIC CURRENT IN CONDUCTORS-Exercises
  1. The potential dofference between the terminals of a battery of emf6.0V...

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  2. The potential difference between the terminals of a 6.0V battery is 7....

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  3. The internal resistance of an accumulator battery of emf 6V is 10(Omeg...

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  4. Find the value of i(1)//i(2)in figure if (a)R=0.1(Omega) (b)R=1(Ome...

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  5. Consider N=n(1).n(2) identical cells, each of emf (epsilon) and intern...

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  6. A battery of emf 100V and a resistor of resistance 10k(Omega)are joind...

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  7. If the reading of ammeter A(1)in figure is 2.4 A, what will the ammete...

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  8. The resistance of the rheostat shown in figure is 30(Omega). Neglectin...

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  9. Three bulbs,each having a resistance of 180(Omega)are connected in par...

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  10. Suppose you have three resistor of (20 Omega),(50Omega)and (100 Omega)...

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  11. A bulb is made using two filaments.A switch selects whether the filame...

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  12. if a current of 12mA exists in the 5k(Omega) resistor, find the curre...

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  13. An ideal battery sends a current of 5A in a resistor.When another resi...

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  14. Find the equivalent resistances of the network shown in figurebetween ...

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  15. A wire of resistance 15.0(Omega)is bent to form a regular hexagon ABCD...

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  16. Consider the circuit shown in figure.Find the current through the10(Om...

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  17. Find the currents through the three resistors shown in Figure

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  18. Shown a part of an electric circuit, The potentials at the points a,b,...

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  19. Each of the resistors shown in figure has a resistances of 10(Omega)an...

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  20. Find the potential difference V(a)-V(b)in the circutis shown in figure

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