Is Induction Wattmeter ,Energy Meter and Watt Hour Meter the same thing
A wattmeter tells you the power being pumped into a target load. If the load consumes 100 watts the meter reads 100 watts. If power drops to zero watts the meter reads zero watts. Should the power be flowing in the opposite direction the wattmeter will read a negative value: -



Note that the meter will read zero in the centre of the scale should it be an analogue meter as depicted in the picture above. Here's where the picture came from.

An energy meter will totalize power over a given time period producing a reading in joules (watt seconds) or watt hours. It must also be able to differentiate negative values of power from positive amounts of power. It's basically formed by adding an integrator to the output of a wattmeter.