An energy meter, having meter constant of 1200 revolutions/kWh, makes 20 revolutions in 30 seconds for a constant load. The load, in kW, is________________.

A dc A-h meter is rated for 15 A, 250V. The meter constant is 14.4 A-sec/rev.  The meter constant at rated voltage may be expressed as

The voltage flux adjustment of a certain 1-phase 220 V induction watt hour meter is altered so that the phase angle between the applied voltage and the flux due to it is 85° (instead of 90°). The errors introduced in the reading of this meter when the current is 5A at power factors of unity and 0.5 lagging are respectively.

If an energy meter disc makes 10 revolutions in 100 seconds when a load of 450 W is connected to it, the meter constant (in rev/kWh) is

The light load adjustment is carried out on a single-phase house-service energy meter under _________________ power factor conditions.