If an energy meter disc makes 10 revolutions in 100 seconds

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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/k Wh) is:

1. 1000
2. 5000
3. 1600
4. 800

Correct Option: D

Given, No. of revolutions = 10
t = 100 sec
p = 450W

K =	10	Rev/W-sec
	450 × 100

or

K =	10 × 3600 × 1000	Rev/W-sec
	450 × 100

or
K = 800