replacing the rotating disc with new one

drilling two diametrically opposite holes in the disc

reducing the considerable load

increasing the gap between the disc and permanent magnet

0 to 30 amperes (extended scale)

0 to 15 amperes (linear scale)

0 to 10 amperes (non. linear scale)

0 to 5 amperes (extended scale)

Dynamometer type wattmeter

Electrostatic type wattmeter

induction type wattmeter

Commutator type wattmeter

the square of the current in fixed coil

the current in the moving coil

the current in the fixed coil and in the moving coil

the current in the fixed coil

D.C. watt hour

D.C. ampere hour

A.C. and D.C. watt hour

A.C. watt hour