Question
Physics Question on Electrical Instruments
The net resistance of an ammeter should be small to ensure that
A
it does not get overheated
B
it does not draw excessive current
C
it can measure large currents
D
it does not appreciably change the current to be measured
Answer
it does not appreciably change the current to be measured
Explanation
Solution
Ammeter are designed to have a small internal resistor in order to measure the current passing on its branch without actually using any of it. Usually, it has a negligible internal resistance and voltage drop which is ideal to use for measurement approximations.