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A 220 V single phase meter has a constant load current of 5.0 A passing through it for 2 hours, at unity power factor. If the meter disc makes 1056 revolution during this period. What is the meter constant in revolutions/kWh?

First, we need to calculate the energy consumed by the load in 2 hours, using the formula:

Energy = Power x Time

Since the power factor is unity, the power consumed by the load is:

Power = Voltage x Current

Power = 220 V x 5.0 A = 1100 W

Time = 2 hours = 2 x 60 minutes = 120 minutes

Energy = 1100 W x 120 minutes / 60 = 2200 Wh = 2.2 kWh

Next, we can calculate the meter constant using the formula:

Meter constant = (Number of revolutions / Energy consumed) x 1000

Meter constant = (1056 / 2.2) = 480 revolutions/kWh