A washing machine rated 300 W operates one hour/day. If the cost of a unit is Rs. 3.00 , find the cost of the energy of operate the washing machine for the month of March.

A washing machine rated 300 W operates one hour/day. If the cost of a

1.	A washing machine rated 300 W operates one hour/day. If the cost of a unit is Rs. 3.00 , find the cost of the energy of operate the washing machine for the month of March.
Answer» Solution :Data : P=300 W, Rs. 3.00 Per unit, t=`1("hour")/("day")xx31` days =31 hours , 1 unit=1 kW`H` `=1000 Wh`, cost of the ENERGY = ? `=(Pt)/(1 K W h//"unit")=(300W xx 31 "hours")/(1000 W h//"unit")` =9.3 units Cost =9.3 units `xx` Rs. 3.00 per unit =Rs. 27.9. The cost of the energy of operate the WASHING machine for the month of March =Rs. 27.9