Explore Key 15 Difference between Galvanometer and Ammeter
Galvanometers and ammeters are two devices used in electrical circuits to measure current, but they possess distinct characteristics that set them apart. Here, we delve into 15 key difference between galvanometer and ammeter, shedding light on their unique features and functionalities.
15 Difference between Galvanometer and Ammeter
Purpose: Compared to ammeters, which are made specifically to measure the amount of electric current, galvanometers are primarily used to detect and measure small currents.
Sensitivity: While ammeters are less sensitive and better suited for measuring larger currents, galvanometers are highly sensitive instruments that can detect minute current flows.
Scale: To make reading and interpreting measurements easier, galvanometers frequently have a linear scale, while ammeters typically have a logarithmic scale.
Internal resistance: Ammeters have a low internal resistance, whereas galvanometers typically have high internal resistance. This distinction makes it possible to connect ammeters in series with the circuit, minimising the effect on the behaviour of the circuit.
Shunt: Shunt: In contrast to galvanometers, ammeters frequently include a shunt resistor to direct extra current away from the metre, ensuring accurate readings without harming the instrument.
Calibration: Galvanometers need to be calibrated frequently due to their high sensitivity, whereas ammeters need calibration less frequently due to their lower sensitivity.
Movement: While ammeters frequently use a digital or analogue display to present the measured values, galvanometers typically use a sensitive moving coil or magnetic needle mechanism to indicate current flow.
Circuit Placement: Galvanometers are typically connected in series with the circuit under test, while ammeters are used to measure the current flowing through the circuit.
Protection: Ammeters are made to withstand higher currents and provide better protection against overload, whereas galvanometers are more delicate and prone to damage from excessive current.
Size: Galvanometers are typically smaller and more portable than ammeters, which are typically bigger because they need more parts to measure current.
Range: Galvanometers frequently have a narrow measurement range, whereas ammeters can be built with a variety of ranges to accommodate a wider range of current intensities.
Accuracy: While ammeters have a lower accuracy but are still useful for measuring general currents, galvanometers are known for their high accuracy, especially in measuring small currents.
Cost: Galvanometers are generally more expensive than ammeters, which are more widely accessible and more reasonably priced, due to their higher sensitivity and precision.
Applications: While ammeters are frequently used in everyday electrical work, power distribution systems, and industrial settings, galvanometers are used in delicate scientific experiments, laboratory research, and specialised measurements.
Flexibility: Compared to ammeters, which are made to be versatile and simple to integrate into different electrical systems, galvanometers are more adaptable to various measurement setups.
Understanding these difference between galvanometer and ammeter is crucial in selecting the appropriate device for specific current measurement needs, taking into account factors such as sensitivity, accuracy, range, and application requirements. By recognizing their unique characteristics, engineers and technicians can ensure precise and reliable current measurements in their respective fields of work.