GATE EE 2015 Set 1 — Question 16
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Electrical & Electronic Measurements → Measurement Principles → Range Extension (Shunts)
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Question
A (0-50 A) 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 – 500 A) is _________.
Correct answer
0.22 to 0.23
Solution
Given:
Full scale meter current, A
Voltage drop at full scale, V
Meter resistance,
Desired full scale current, A
Multiplying factor,
Shunt resistance required,
Thus, the shunt resistance needed is approximately milliohms.
Full scale meter current, A
Voltage drop at full scale, V
Meter resistance,
Desired full scale current, A
Multiplying factor,
Shunt resistance required,
Thus, the shunt resistance needed is approximately milliohms.
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