What shunt resistance must be connected across a Galvanometer of 20 Ω resistance which gives full scale deflection with 2.0 A current, so as to convert it into an Ammeter of range 10 A?
Correct answer: A. 5 Ω
- A. 5 Ω
- B. 2 Ω
- C. 3 Ω
- D. 4 Ω
Explanation
Explanation: Galvanometer resistance = G = 20Ω Current = I1 = 10A Current = I2 = 2 A Shunt resistance = Rs = ?So, n = I1 / I2 n = 10 / 2 = 5Applying the formula: Rs = G / n - 1 = 20 / 5 - 1 = 20 / 4 Rs = 5 ohms
This question appeared on the UHS MDCAT 2009 paper, which you can sit online with every answer explained.
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