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A (0-50A) moving coil ammeter has a voltage drop of 0.1 V across its terminals at full scale deflection. The external shunt resistance (in milliohms) needed to extend its range to (0-500A) is ________.
    Correct answer is '0.22'. Can you explain this answer?
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    A (0-50A) moving coil ammeter has a voltage drop of 0.1 V across its t...
    Solution:

    Given:
    Full scale deflection current (Ifsd) = 50A
    Voltage drop at Ifsd = 0.1V
    Range to be extended = (0-500A)

    To extend the range of the ammeter, an external shunt resistance (Rs) is connected in parallel with the moving coil ammeter. The shunt resistance carries most of the current and the ammeter measures only a fraction of the total current.

    The formula for the shunt resistance is given by:
    Rs = Ifsd * Ammeter resistance / (Range - Ifsd)

    where,
    Ammeter resistance = Voltage drop at Ifsd / Ifsd
    Range = Desired range of the ammeter

    Substituting the given values, we get:

    Ammeter resistance = 0.1V / 50A = 0.002 ohms
    Range = 500A - 50A = 450A

    Rs = Ifsd * Ammeter resistance / (Range - Ifsd)
    Rs = 50A * 0.002 ohms / (450A - 50A)
    Rs = 0.22 milliohms

    Therefore, the external shunt resistance needed to extend the range of the ammeter to (0-500A) is 0.22 milliohms.
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    A (0-50A) moving coil ammeter has a voltage drop of 0.1 V across its t...
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    A (0-50A) moving coil ammeter has a voltage drop of 0.1 V across its terminals at full scale deflection. The external shunt resistance (in milliohms) needed to extend its range to (0-500A) is ________.Correct answer is '0.22'. Can you explain this answer?
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