Question

Physics
A washing machine rated 300 W is operated one
and half an hour/day. If the cost of unit * 3.50, find
the cost of energy to cooperative a washing
machine for the month of September
(1) 27.90
(2) 35.25
(3) 47.25
(4) 55.90
​

Answer 1

Answer:

Now, the units consumed (kWh) = power (kW) x time (hours)

There are 30 days in the month of September, thus 1.5x30 = 45 hours

Thus the number of units is given by 300 x 10

−3

x 45

Total number of units = 13.5 units

Thus the energy cost for 13.5 units is 13.5 x 3.5 =Rs 47.25$$