Question

Inside an ammeter there will always be a galvanometer and
A. A high resistance connected in series with it
B. A low resistance connected in series with it
C. A high resistance connected in parallel with it
D. A low resistance connected in parallel with it

Answer 1

This question is based on the concept of parallel resistance used in the Galvanometer inside the ammeter. You have to apply the concept of parallel resistance and check the current flowing to which resistance and how it helps in the ammeter working.

Complete step by step answer:
In Galvanometer, there is a small resistance incorporated parallel to the Galvanometer to use it as ammeter, due to low resistance in parallel the overall resistance gets lowered and current passes through that.
A Galvanometer is a device used in electrical circuits to measure the current. It first detects then indicates the electric current. Ammeters are improved devices used to measure the electric current, and the only difference between ammeter and Galvanometer is that the ammeter has a Galvanometer inside it and the ammeter is with the calibration property.
The principle behind the use of Galvanometer in ammeter with low resistance in parallel because we know that if the resistance is connected in parallel, then the overall circuit resistance gets lowered. And current always passes through the low resistance path; hence, the current measurement gets easier.
This type of objective question needs a typical understanding of the electrical circuit. We should know the concepts of resistance, voltage and current because this is the basis of all the devices used to measure the parameters of the circuit.

So, the correct answer is “Option D”.

Note:
Here we used the concept of parallel resistance. You may go wrong in analysing the current flow to which resistance is in parallel. If two resistances are connected in parallel combination, then the overall resistance gets reduced.