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AaronAndyson

  • one year ago

http://prntscr.com/8ie2s0

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  1. zzr0ck3r
    • one year ago
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    that looks like Chinese to me.

  2. AaronAndyson
    • one year ago
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    Okay.I'll type the question.

  3. AaronAndyson
    • one year ago
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    Three resistors are connected in parallel.Draw a circuit including a switch and a battery . Derive the equivalent resistance of such a circuit.

  4. AaronAndyson
    • one year ago
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    @zzr0ck3r You there?

  5. zzr0ck3r
    • one year ago
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    nono I am saying I don't know the subject...

  6. zzr0ck3r
    • one year ago
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    lol

  7. AaronAndyson
    • one year ago
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    @welshfella @Abhisar

  8. Abhisar
    • one year ago
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    Do you know anything about Ohm's law?

  9. AaronAndyson
    • one year ago
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    Yep.

  10. Abhisar
    • one year ago
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    Good, so lets's start. I'll leave part (a) for you.

  11. AaronAndyson
    • one year ago
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    Actually,I got part(b) also.

  12. AaronAndyson
    • one year ago
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    Stcuk at part(c)

  13. AaronAndyson
    • one year ago
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    Stuck*

  14. Abhisar
    • one year ago
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    Ok, current in the circuit can be calculated by using the formula, \(\sf \boxed{\Large I=\frac{Emf}{r+R}}\)

  15. Abhisar
    • one year ago
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    r=internal resistance, R=external resistance

  16. AaronAndyson
    • one year ago
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    Curent = 0.06A?

  17. AaronAndyson
    • one year ago
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    0.096*

  18. Abhisar
    • one year ago
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    Yes.

  19. AaronAndyson
    • one year ago
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    I've no idea how to go about the rest :(

  20. Abhisar
    • one year ago
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    Potential difference across each resistor: You know the current flowing (I) now. use V=IR for each resistor. E.g. across 20 ohms resistor voltage drop will be 0.096*20

  21. AaronAndyson
    • one year ago
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    0.96*2?

  22. Abhisar
    • one year ago
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    WHat?

  23. AaronAndyson
    • one year ago
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    1.92V?

  24. AaronAndyson
    • one year ago
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    p.d across 20 ohm resistor is 1.92?

  25. Abhisar
    • one year ago
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    YEs.

  26. AaronAndyson
    • one year ago
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    and the latter is 0.48?

  27. AaronAndyson
    • one year ago
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    i.e across the 5 ohm resistor.

  28. Abhisar
    • one year ago
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    Yes

  29. AaronAndyson
    • one year ago
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    and across the cell?

  30. Abhisar
    • one year ago
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    Ok, let's do the last one first... When the current is flowing, then the potential difference between the terminals of the cell < EMF and that potential drop V is given by, V= (emf of the cell) - Current X internal resistance. V= 2.5 - 0.096 X 1

  31. Abhisar
    • one year ago
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    Getting it? This is the solution for last one....

  32. AaronAndyson
    • one year ago
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    wait what?

  33. AaronAndyson
    • one year ago
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    that should be the p.d across the cell...

  34. Abhisar
    • one year ago
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    Nuuu...I explained it wrong earlier....chuck that from ur mind..

  35. Abhisar
    • one year ago
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    Is it clear now???

  36. AaronAndyson
    • one year ago
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    OK!

  37. AaronAndyson
    • one year ago
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    so p.d across the cell is?

  38. Abhisar
    • one year ago
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    Recall what we did to find the pd across resistors??? We multiplied their individual resistances with current flowing..Right?

  39. AaronAndyson
    • one year ago
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    Yep.

  40. Abhisar
    • one year ago
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    Similarly, to find pd across the cell we will multiply the current with resistance of cell i.e. internal resistance...

  41. Abhisar
    • one year ago
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    Can you find it for me?/

  42. AaronAndyson
    • one year ago
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    You mean 2.5*1?

  43. Abhisar
    • one year ago
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    What's the current?

  44. AaronAndyson
    • one year ago
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    0.096*2.5 = p.d across the cell?

  45. Abhisar
    • one year ago
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    Nuu..Current X Internal resistance....

  46. Abhisar
    • one year ago
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    Current = ? Internal resistance = ?

  47. AaronAndyson
    • one year ago
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    Ugh...idk...... :'(

  48. AaronAndyson
    • one year ago
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    Internal resistance = 1 ohm

  49. Abhisar
    • one year ago
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    Internal resistance is given in the question and we calculated the current in 1st part :O

  50. AaronAndyson
    • one year ago
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    I know...Zoned out xD

  51. AaronAndyson
    • one year ago
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    Current is 0.096A and Internal Resistance is 1 ohm

  52. AaronAndyson
    • one year ago
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    Voltage drop = current*internal resitance right?

  53. AaronAndyson
    • one year ago
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    resistance*

  54. Abhisar
    • one year ago
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    Yes

  55. AaronAndyson
    • one year ago
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    so 0.096 is the voltage drop?

  56. Abhisar
    • one year ago
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    \(\huge \checkmark\) Voltage drop across the cell

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