Question: A resistance of value 10Ω approximately is to be measured by ammeter-voltmeter method with resistance of ammeter is 0.02Ω and that of voltmeter is 5000Ω. The resistance should be measured
Answer:
MCQ: A resistance of value 10Ω approximately is to be measured by ammeter-voltmeter method with resistance of ammeter is 0.02Ω and that of voltmeter is 5000Ω. The resistance should be measured
Correct Answer:
A. By connecting the ammeter on the side of unknown resistance as this connection gives better accuracy
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Related Questions
- 1. A unknown resistance is measured by substitution method. First a standard known resistance of 100 Ω is connected in series with a circuit having a rheostat and a galvanometer. The battery voltage is 10V and the setting of rheostat is 500 Ω and the galvanometer shows a deflection of 60°. After this test. The battery voltage goes down to 9 V and when the unknown resistance is substituted for the known resistance, the galvanometer again shows a deflection of 60° with the same setting of the rheostat. The value of unknown resistance is :
- 2. Equal resistance of 100 Ω each are connected in each arm of wheatstone bridge which is supplied by 2 V battery source. The galvanometer of negligible resistance connected to the bridge can sense as low current as 1 µA. the smallest value of resistance that can be measured is
- 3. A wheatstone bridge has ratio arms of 1000Ω and 100Ω resistance, the standard resistance arms consists 4 decades resistance boxes of 1000,100,10 ,1 Ω steps. The maximum and minimum value of unknown resistance which can be determined with this set up is
- 4. A wheatstone bridge can not be used for precision measurements because errors are introduced into on account of
- 5. A Kelvin-varley slide consists of 4 decade dividers. The first decade is constructed by having 11 coils of 10 kΩ resistance each. The subsequent decades will have coils of :
- 6. Low resistance are provided with four terminals
- 7. In a kelvin’s double bridge two sets of readings are taken when measuring a low resistance, one with the current in one direction and the other with the direction of the current reversed. This is done to :
- 8. High resistances are provided with a guard terminal.This guard terminal is used to :
- 9. When measuring insulation resistance of cables using d.c sources, the galvanometer used should be initially short circuited because .
- 10. A circular peice of specimen has a surface resistance R<sub>s.</sub> its diameter is d and the thickness is t. the surface resistivity ps of the specimen is given by :
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