These meters can be used on dc as well as on ac circuits. In principle the motor meter is a small motor of dc or ac type whose instantaneous speed of rotation is proportional to the circuit current in case of an ampere-hour meter and to the power of the circuit in case of a watt-hour meter. The number of revolutions made by revolving portion (rotor) in any given time is proportional, in case of A-H meter, to the quantity of electricity supplied during that time; and in case of energy meter to the energy supplied. A train of wheels connected to the spindle (rotor) count the number of revolutions made and thus register the AH or kwh directly.
These meters essentially consist of (i) an operating system (ii) a braking device and (ii) a registration device. An operating system develops the driving torque that causes the rotation of the moving system continuously. The driving torque may be compared with the deflecting torque in an indicating instrument.
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