What is the sensitivity of the galvanometer (that is, what current gives a full-scale deflection

step 1 So as the question says, sensitivity is the current that gives full -scale deflection on 100 vol

What is the sensitivity of the galvanometer (that is, what...

Key Concepts

Galvanometer Sensitivity

Galvanometer sensitivity is defined as the minimum current required to produce a full-scale deflection of the instrument’s needle. This sensitivity determines how effectively the galvanometer can detect small currents and is a crucial parameter when using it for measurements in various electrical instruments.

Full-Scale Deflection

Full-scale deflection refers to the condition where the galvanometer’s needle reaches the end of its calibrated scale. This is achieved when the current through the device equals the sensitivity current, marking the maximum measurable value without overloading the instrument.

Series Resistor in Voltmeters

In order to extend the range of a galvanometer for voltage measurements, a large series resistor is connected with it. This resistor limits the current passing through the sensitive galvanometer when exposed to higher voltages, thereby allowing it to function effectively as a voltmeter over a specified voltage range.

Ohm's Law

Ohm's Law, which relates voltage, current, and resistance (V = IR), is fundamental in analyzing circuits involving galvanometers. In the context of the voltmeter, it is used to calculate the current through the galvanometer based on the known voltage range and the total resistance of the meter, ensuring that the instrument is calibrated for accurate full-scale deflection.

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