Presented by GAURAV KUMAR GUPTA

ELECTRODYNAMOMETER TYPE

WATTMETER

EARLY WATTMETER ON DISPLAY

AT THE HISTORIC ARCHIVE

AND MUSEUM OF MINING IN 

PACHUCA, MEXICO

.

WATTMETER

 THE CIRCUIT OF A SIMPLE ELECTRODYNAMOMETER TYPE

WATTMETER

The wattmeter is

an instrument for

measuring the

electric power (or

the supply rate of

electrical energy)

in watts of any

given circuit.

ELECTRODYNAMOMETER TYPE WATTMETER

There are two coils fixed coils or “field coils” and movable coil.

The fixed coil makes current coil (cc) of the wattmeter and are connected in series with the load and so carry the current in the circuit.

The movable coil is connected across the voltage and it carries a current proportional to the voltage.

A non inductive resistance (having high resistance value) is connected in series with the moving coil limit the current to a small value.

This coil is also known as pressure coil or voltage coil of the wattmeter.

CONSTRUCTION OF ELECTRODYNAMOMETER

WATTMETER

FIXED COILS

MOVABLE COILS

CONTROL ADJUSTMENT

DAMPING

SCALE AND POINTERS

Siemens electrodynamometer

THANK YOU