Calculate the current in a 75 Ω resistor when a potential difference of 115 V is placed across it. What will the current be if the resistor

Question

Calculate the current in a 75 Ω resistor when a potential difference of 115 V is placed across it. What will the current be if the resistor is replaced with a 47 Ω resistor?

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Hải Đăng 4 years 2021-08-17T14:37:26+00:00 2 Answers 10 views 0

Answers ( )

  1. Doris
    0
    2021-08-17T14:38:44+00:00
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    Answer:

    i = 1.533\,A, i = 2.447\,A

    Explanation:

    The current is determined by the Ohm’s Law:

    \Delta V = i \cdot R

    i = \frac{\Delta V}{R}

    The current in a 75\,\Omega Resistor is:

    i=\frac{115\,V}{75\,\Omega}

    i = 1.533\,A

    If current resistor is replaced by 47\,\Omega model, then the current is:

    i = \frac{115\,V}{47\,\Omega}

    i = 2.447\,A

  2. Dau
    0
    2021-08-17T14:38:49+00:00
    Reply

    Answer:

    1.53A; 2.45A

    Explanation:

    According to ohm’s law which states that the current passing through a metallic conductor at constant temperature is directly proportional to the potential difference across its ends. Mathematically,

    V = IR where;

    V is the potential difference

    I is the current

    R is the Resistance.

    If a a potential difference of 115 V is placed across 75ohms resistor, the current in the resistor can be calculated as;

    I = V/R where;

    V = 115V

    R = 75ohms

    I = 115/75

    I = 1.53A

    If the resistor is replaced with a 47ohms resistor, the current I’m the resistor will be calculated as;

    I = V/R

    I = 115/47

    I = 2.45A

    According to the answers, the current decreases with increasing resistance because resistance tends to oppose the flow of current.

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