How many times will the metal disc on an electric meter turn if you consume 1 kilowatt of power?

Answer 1

An electric meter measures energy usage, not power.

The kilowatt is a unit of power (energy per unit time).
A kilowatt hour is a unit of energy.

The question should either be asking for the speed of rotation of the disk if the energy usage is at 1 kW of power, or the unit should be changed to kWh instead.

It seems to reason that for every 1 kWh of enegry used, the metal disk on the "power meter" (really an energy meter) would go around once, but in reality, they might be designed a tad more complicated than this.

Answer 2

If your metal disc measures kiowatts per hour. Then using one kilowatt of power will turn the disc completly once. It does not matter how long it takes to use the kilowatt, as only the rate of how fast you use it will make the disc spin faster or slower.

This is asumming that one rotation of the disc is one kilowatt. If not you have to divide 1/the no of kilowatts for one rotation x 360 degrees.

Answer 3

It depends upon the manufacturer. They are made to rotate with a particular speed depending upon the total power consumed by the customer per month.

For example a meter designed to carry a current of 5 to 10 A, working in 250 V
at 50 cycles per second is designed to have 1200 revolutions per kilowatt-hour.

Answer 4

Utility meters measure kilowatt-hours.