(I) An ammeter has a sensitivity of 35,000 Ω/ V. What...

Key Concepts

Ammeter

An ammeter is an instrument used to measure the electric current in a circuit. It is designed to offer minimal resistance to avoid altering the circuit conditions significantly, and its accuracy depends on proper calibration, often involving integrating a highly sensitive instrument such as a galvanometer.

Galvanometer

A galvanometer is a sensitive device that detects and measures small currents by the deflection of a needle in response to the magnetic field produced by the current passing through a coil. Its full-scale deflection current is a critical parameter that indicates the maximum current the device can measure before the needle reaches the end of its calibrated scale.

Sensitivity (?/V)

Sensitivity in ohms per volt (?/V) is a specification that relates the voltage applied across a device to the resistance required for full-scale deflection. It provides a measure of how much voltage is needed to produce a full-scale reading, which can then be used in conjunction with Ohm's law to determine the current threshold for full-scale deflection in instruments like galvanometers.

Ohm's Law

Ohm’s law is a fundamental principle in electronics that states the current through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance. This law underpins the calculation of full-scale deflection current in a measurement device by relating the sensitivity (defined as resistance per unit voltage) with the applied voltage.

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