An ammeter of resistance 0.81 ohm reads up to 1 A. The value of therequired 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 therequired shunt to increase the range to 10 A is
Solution
The shunt resistance can be calculated using the formula:
Rs = (Ra * Im) / (I - Im)
where:
- Rs is the shunt resistance,
- Ra is the ammeter resistance,
- Im is the maximum current the ammeter can measure without the shunt, and
- I is the total current we want the ammeter to measure with the shunt.
Substituting the given values:
Rs = (0.81 ohm * 1 A) / (10 A - 1 A)
Rs = 0.81 ohm / 9
Rs = 0.09 ohm
So, the value of the required shunt to increase the range to 10 A is 0.09 ohm.
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