Explanation: Higher resistance values are required to measure relatively higher input voltage. For example, if the range of switch is at x10 position in the low voltage dc voltmeter then, the corresponding resistance value would be 10kΩ. So, it requires a 10v input to get a full scale deflection (if 1v cause full scale deflection in the ammeter with a full scale deflection of 1mA). 7. In the diagram given below, determine the deflection of the ammeter with a full scale deflection of 1mA when the switch is at X2kΩ. Consider resistance of the offset voltage compensating network to be 10Ω.
A. Full scale deflection in the ammeter
B. Half scale deflection in the ammeter
C. Quarter scale deflection in the ammeter
D. No deflection occurs in the ammeter
Answer:A
Explanation: Higher resistance values are required to measure relatively higher input voltage. For example, if the range of switch is at x10 position in the low voltage dc voltmeter then, the corresponding resistance value would be 10kΩ. So, it requires a 10v input to get a full scale deflection (if 1v cause full scale deflection in the ammeter with a full scale deflection of 1mA). 7. In the diagram given below, determine the deflection of the ammeter with a full scale deflection of 1mA when the switch is at X2kΩ. Consider resistance of the offset voltage compensating network to be 10Ω.
A. Full scale deflection in the ammeter B. Half scale deflection in the ammeter C. Quarter scale deflection in the ammeter D. No deflection occurs in the ammeter
Explanation: Given Vin=1v ,R1=10+2kΩ ≅2kΩ