Current Electricity and Electrical InstrumentHard
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
A battery of emf E and internal resistance r is connected across a resistance R. Resistance R can be adjusted to any val...Four equal resistors, each of resistance 10 ohm are connected as shown in the adjoining circuit diagram. Then the equiva...A potentiometer circuit has been set up for finding the internal resistance of a given cell. The main battery, used acro...When the switches are arranged so that the current through the battery is minimum, what is the voltage across points A a...A light source, which emits two wavelengths λ1= 400 nm and λ2= 600 nm, is used in a Young′s double slite...