The meter element of a permanent-magnet moving coil instrument has a resistance of 5 Ω and requires 250 mA for full-scale deflection. Calculate the resistance to be connected to enable the instrument to read up to 1 A.
1
5 Ω resistance in series
2
5/3 Ω resistance in parallel
3
5 Ω resistance in parallel
4
5/3 Ω resistance in series