A circuit consists of a resistor, a battery and an ammeter. The ammeter shows a current of 0.2A when the resistor is 120. If you want to get

Question

A circuit consists of a resistor, a battery and an ammeter. The ammeter shows a current of 0.2A when the resistor is 120. If you want to get a current of 0.15A, what resistor should be used to replace the current resistor?

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Kim Chi 2 months 2021-07-21T10:30:32+00:00 1 Answers 5 views 0

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    2021-07-21T10:32:21+00:00

    Answer:

    A resistor of 160 ohms should be used to replace the current resistor

    Explanation:

    Applying,

    Ohm’s Law

    V = IR………………. Equation 1

    Where V = Voltage of the battery, I = current, R = Resistance

    From the question,

    Given: I = 0.2 A, R = 120 ohms.

    Substitute these values into equation 1

    V = 0.2×120

    V = 24 V

    IF a current of 0.15 A is required,

    make R the subject of equation 1

    R = V/I…………… Equation 2

    Given: V = 24 V, I = 0.15 A

    Substitute these values into equation 2

    R = 24/0.15

    R = 160 ohms.

    Hence a resistor of 160 ohms should be used to replace the current resistor

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