On Friday, October 4, 2019 at 12:03:21 AM UTC-4, Oumati Asami wrote:
Any way to find out whether the electric meter is giving the accurate
reading?

You could buy a Kill-a-Watt meter, which is a plug-in meter that
allows you to measure power and energy used to anything you can
plug into it. You'd have to turn off all the breakers except
one on the circuit you plug it into and make sure there are no other
loads. Let it run for a couple hours with a substantial load
and see how they compare. They cost about $20.

I'd do it separately with both a resistance load like a heater with
no fan and a load that has reactance, eg a motor.