railway DFCCIL Executive 2025 Mock Test Electrical and Electronics Measurements Extension Ranges of Basic Meters
A moving-coil instrument has a resistance of 10 Ω and gives a full-scale deflection when carrying a current of 50 mA. What external resistance should be connected so that the instrument can be used to measure current up to 50 A?
1
20 Ω in parallel
2
100 Ω in series
3
0.010 Ω in parallel
4
18.7 Ω in series