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State Ohm's law. Derive an expression fo...

State Ohm's law. Derive an expression for the equivalent resistance of a number of resistances in parallel.

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Find an expression for equivalent resistance of three resistors joined in parallel.

What is Ohm's law ? How is it represented graphically ? Derive an expression for the resultant resistance of a series combination of resistors.

Knowledge Check

  • Equivalent resistance (in ohm) of the given network is

    A
    28
    B
    18
    C
    26
    D
    25

  • Ohm's law expressed as E = IR

    A
    can never be applied to AC
    B
    applies to AC in the same manner as to DC
    C
    always applies to AC circuits when Z is substituted for R
    D
    tells us that ` underset(eff)(E) `= 0.707 (` underset(max)(E) `) for AC

  • Three equal resistances when combined in series are equivalent to 90 ohm. Their equivalent resistance when combined in parallel will be:

    A
    10 ohm
    B
    30 ohm
    C
    270 ohm
    D
    810 ohm

    • Similar Questions

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    Derive expression for equivalent resistance of a parallel combination of resistances. (b) Calculate the ratio of equivalent resistance for a series combination of n number of identical resistors to the parallel combination of the same type of n number of resistors.

    With the help of a diagram derive the formula for the equivalent resistance of three resistances connected n parallels?

    State Ohm's law. Derive the laws of resistances, when they are connected: (i) in series (ii) in parallel.

    What is the ratio of equivalent resistance of series combination of n equal resistance to the equivalent resistance in parallel combination of these n resistances ?

    Calculate the equivalent resistance when two resistances of 3 ohms and 6 ohms are connected in parallel.

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