Electrical and Electronics Measurements Extension Ranges of Basic Meters

The range of an ammeter is 0-50 mA with an internal resistance of 40 ohm. What is the value of the shunt resistance that should be added to the ammeter, in order to extend the range to 0-150 mA?

1

10 ohm

2

20 ohm

3

30 ohm

4

40 ohm

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