A 100 V battery is connected across a resistor and causes a current of 5mA to flow. Determine the resistance of the resistor. If the

Question

A 100 V battery is connected across a resistor and causes a current of 5mA to flow. Determine
the resistance of the resistor. If the voltage is now reduced to 25 V, what will be the new value
of the current flowing?

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Thái Dương 5 years 2021-08-24T06:03:44+00:00 1 Answers 7 views 0

Answers ( )

  1. haidang
    0
    2021-08-24T06:05:26+00:00
    Reply

    Answer:

    R = 20000 ohms

    I = 1.25 mA

    Explanation:

    From the question,

    V = IR………………. Equation 1

    Where V = Voltage, I = Current, R = Resistance.

    Make R the subject of the equation

    R = V/I…………… Equation 2

    Given: V = 100 V, I = 5 mA = 0.005 A

    Substitute into equation 2

    R = 100/0.005

    R = 20000 ohms.

    If the Voltage is reduced to 25 V,

    I = V/R……………… Equation 3

    Given: V = 25 V, R = 20000 ohms.

    Substitute these values into equation 3

    I = 25/20000

    I = 1.25 mA

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