Difference between Galvanometer and Ammeter
Science is a broad subject highlighting various key subjects like inertia, gravity, electric current, the human system, chemical formulas, etc. Science is not only limited to textbooks but is also used in our daily lives. Science is used in every field. For instance, many equipments and technologies are used to predict the natural calamities that can harm people. There are also certain technologies through which the damage done through calamities can also be measured.
So today, we will be talking about physics. Physics includes many topics like gravity, electricity, electric currents, etc. So, today we will discuss about electric currents and the ways one can measure them. There are two instruments with which we can measure these electric currents, i.e., galvanometer and ammeter. Well, there are certain differences between them, but let us start with their primary definitions.
A galvanometer is defined as an electromechanical instrument that is used for measuring electric currents. The small amounts of current are measured through a galvanometer. A galvanometer can be considered as an actuator. Now, what is an actuator? Well, an actuator is responsible for moving and controlling a specific system. The galvanometer was invented by Luigi Galvani and was first observed/ discovered by Hans Christian Orsted in 1820. Modern-day galvanometers are used for controlling and positioning the systems. Galvanometers are divided into two kinds, i.e., closed-loop and open-loop galvanometers. Apart from these two kinds, there are four types of galvanometers, namely tangent galvanometers, astatic galvanometers, mirror galvanometers, and ballistic galvanometers.
In earlier times, galvanometers were used for finding discrepancies in telecommunication cables. Galvanometers function on one basic principle, i.e., the coil having a current in the magnetic field experiences a rotation or a force. One of the major advantages of a galvanometer is that it carries a very high sensitivity. The accuracy and flexibility are also high, and it is not affected by the magnetic fields. One of the prominent disadvantages of a galvanometer is that overload can spoil it. The force or rotation in a current cannot be changed easily. The temperature change can cause the electric current to change its rotation or increase/ decrease its force. It is interesting to note that the galvanometer does not depict any quantity, i.e., there is no least count of a galvanometer. The range of the galvanometer is 500ohm.
An ammeter is defined as an instrument that is used for measuring a wide range of currents. Direct and alternative electric current is measured through an ammeter. Now, how does an ammeter work? Well, an ammeter is used to measure an electric current through a set of coils having low resistance and inductive reactance. There are several types of ammeter depending upon the construction and the measurement of current. The unit used for measuring the current in the ammeter is amperes. There are seven significant types of an ammeter. They are:
The range of an ammeter is 0-3 ampere, including thirty divisions. The formula for measuring a current through an ammeter is V=IR. In this formula, R is the resistance, I is the current flowing, and V is the difference between the two. An advantage of an ammeter is that it is portable as well as strong. It can be used in both Ac and Dc measurements, and it does not depend upon the magnetic field of the earth. One of the major disadvantages of an ammeter is that it is cannot store data. Now, there are several differences between an ammeter and a galvanometer. So, let us have a look at them.
So, these are some of the contrasting points regarding the galvanometer and ammeter. Now, there are certain advantages and disadvantages associated with both of them. So, let us have a look at them.
Advantages of Galvanometer
Disadvantages of Galvanometer
Advantages of Ammeter
Disadvantages of Ammeter
So, these are some of the advantages and disadvantages of galvanometers and ammeters. Both these instruments are used for measuring electric currents. They are portable and accurate. Thus, both galvanometer and ammeter are essential instruments for measuring a small and wide range of currents.