An ammeter of resistance 0.81 ohm reads up to 1 A. The value of the required shunt to increase the range to 10 A is
Question
An ammeter of resistance 0.81 ohm reads up to 1 A. The value of the required shunt to increase the range to 10 A is
Solution
To calculate the value of the required shunt to increase the range of the ammeter to 10 A, we can use the formula for shunt resistance:
Rs = (Rm / Im) - Rm
Where: Rs = Shunt resistance Rm = Resistance of the ammeter Im = Maximum current reading of the ammeter
Given that the resistance of the ammeter (Rm) is 0.81 ohm and the maximum current reading (Im) is 1 A, we can substitute these values into the formula:
Rs = (0.81 ohm / 1 A) - 0.81 ohm
Rs = 0.81 ohm - 0.81 ohm
Rs = 0 ohm
Therefore, the value of the required shunt to increase the range of the ammeter to 10 A is 0 ohm.
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