Question:
The net resistance of an ammeter should be small to ensure that
The net resistance of an ammeter should be small to ensure that
Updated On: Jun 14, 2022
- it does not get overheated
- it does not draw excessive current
- it can measure large currents
- it does not appreciably change the current to be measured
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The Correct Option is D
Solution and Explanation
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.
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Concepts Used:
Electrical Instruments
There are various electrical instruments used to measure current, power, voltage, etc. Some of them are briefly explained below:
Moving Coil Galvanometer
- It is an electromagnetic device which measures small values of current.
- Its working principle is that whenever a current loop is placed in a magnetic field, it experiences a certain torque. The value of that torque can be modified by modifying the current in the loop.
- For a current carrying loop having N turns, and cross sectional area A, carrying current i, whenever it is placed in and along the direction of an external magnetic field B, it experiences a torque given by:
ԏ = NiAB
