Current Electricity and Electrical InstrumentEasy
Question
A microammeter has a resistance of 100Ω and full scale reange of μ A. It can be used as voltmeter or as higher range ammeter provided a resistance is added to it. Pick the correct range and resistance combination (s)
Options
A.50 V range with 10 k Ω resistance in series
B.10 V range with 200 k Ω resistance in series
C.5 mA range with 1Ω resistance in paallel
D.10 mA range with 1 Ω resistance in parallel
Solution
To increase the range of ammeter a parallel resistance (called shunt) is required which is given by
For option (c) S =
To change it in voltmeter, a high resistance R is put in series, where R is given by
R =
For option (b)
200kΩ
There, option (b) and (c).
For option (c) S =
To change it in voltmeter, a high resistance R is put in series, where R is given by
R =
For option (b)
200kΩThere, option (b) and (c).
Create a free account to view solution
View Solution FreeTopic: Current Electricity and Electrical Instrument·Practice all Current Electricity and Electrical Instrument questions
More Current Electricity and Electrical Instrument Questions
The temperature at which thermal electric power of a thermo couple becomes zero is called :-...N sources of current with different emf′s are connected as shown in figure. The emf′s of the sources are pro...The resistance of a wire is 'R' ohm. If it is melted and stretched to 'n' times its original length, its...The resistance of the galvanometer is 25 Ω it gives a full scale deflection when a current of 10mA is passed throug...The wires of two electric heaters are made up of same material and have same value. On combining them firstly in series ...