Match List-I with List-II
| LIST-I (Electrical devices/ component) | LIST-II (Uses) | ||
|---|---|---|---|
| A. | Ammeter | I. | Used to convert galvanometer to ammeter |
| B. | Voltmeter | II. | measures current |
| C. | Galvanometer | III. | detects small currents |
| D. | Shunt resistance | IV. | measure potential difference |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → A-II, B-IV, C-III, D-I
A galvanometer detects small currents. It is turned into an ammeter with a small shunt resistance in parallel, and into a voltmeter with a large resistance in series.
(A) Ammeter — this matches (II) measures current. It is connected in series with the circuit element whose current is required.
(B) Voltmeter — this matches (IV) measure potential difference. It is connected in parallel across the element.
(C) Galvanometer — this matches (III) detects small currents. Its coil deflects even for currents of a few microamperes.
(D) Shunt resistance — this matches (I) Used to convert galvanometer to ammeter. The low shunt carries most of the current, so the ammeter has a low resistance and a larger range.
NCERT (2026-27):
The Moving Coil Galvanometer – “… The galvanometer can be used in a number of ways. It can be used as a detector to check if a current is flowing in the circuit.”
The Moving Coil Galvanometer – “… The galvanometer cannot as such be used as an ammeter to measure the value of the current in a given circuit.”
The Moving Coil Galvanometer – “… The galvanometer can also be used as a voltmeter to measure the voltage across a given section of the circuit.”
Summary – “… 11. A moving coil galvanometer can be converted into a ammeter by introducing a shunt resistance rs, of small value in parallel.”