![]() The fixed coil is divided into two equal parts and these are connected in series with the load, therefore the load current will flow through these coils. Hence moving coil is connected across the voltage and thus the current flowing through this coil is always proportional to the voltage. ![]() In electrodynamometer type wattmeter, moving coil works as pressure coil. The moving is air cored and is mounted on a pivoted spindle and can move freely. So in order to limit the current we have connected the high value resistor in series with the moving coil. Limited of current flows through the moving coil so as to avoid heating. Moving coil moves the pointer with the help of spring control instrument. ![]() ![]() There are two types of coils present in the electrodynamometer. Now let us look at constructional details of electrodynamometer. Construction and Working Principle of Electrodynamometer Type Wattmeter Dynamometer type wattmeter works on very simple principle and this principle can be stated as when any current carrying conductor is placed inside a magnetic field, it experiences a mechanical force and due to this mechanical force deflection of conductor takes place. Before we study the internal construction of electrodynamometer type wattmeter, it is essential to know the working principle of electrodynamometer type wattmeter.
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