Electric Meter?

Electroenthusiast

Active Member

• Sep 14, 2009

• #1

What Does Electric Meter present in household measure? I've heard that it measures 'KWh'. But what exactly runs the Meter? Current/Voltage ??

 

tcmtech

Banned

Most Helpful Member

• Sep 14, 2009

• #2

Both. It uses the ratio of amps to volts to measure watthours.

 

Electroenthusiast

Active Member

• Sep 14, 2009

• #3

y voltage? voltage will be constant Right?

 

Nigel Goodwin

Super Moderator

Most Helpful Member

• Sep 14, 2009

• #4

r.vittalkiran said:

y voltage? voltage will be constant Right?

Click to expand...

Because watts = volts x amps.

Voltage isn't constant anywhere, and VERY unconstant in many parts of the world.

 

Papabravo

Well-Known Member

• Sep 14, 2009

• #5

r.vittalkiran said:

y voltage? voltage will be constant Right?

Click to expand...

The last DC power system in NYC was shut down recently. It was used to run the elevators in some buildings built there at the turn of the last century. In the rest of the world commercial power is AC. Neither the current, not the voltage is ever constant in an AC system. Wherever did you get such quaint notions?

https://cityroom.blogs.nytimes.com/2007/11/14/off-goes-the-power-current-started-by-thomas-edison/

 

Last edited: Sep 14, 2009

crutschow

Well-Known Member

Most Helpful Member

• Sep 14, 2009

• #6

The meter motor has both a voltage coil and a current coil, thus the speed of the meter wheel is determined by the volts times amps (on an instantaneous basis so the speed of the wheel is an indication of the true power). This is integrated by the dials to indicate the power over time, giving energy in kWh.

 

Last edited: Sep 14, 2009