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10 tube lights of 20 watt each are used in house for 5 hours daily calculate the bill of one month for the electricity with the rate of rupees 7.30 per unit.

10 tube lights of 20 watt each are used in house for 5 hours daily calculate the bill of one month for the electricity with the rate of rupees 7.30 per unit.

Grade:10

2 Answers

Arun
25763 Points
one year ago
Dear student
 
Total units for 1 bulb (kwh) = watt * hour * day /1000 = 20*5*30/1000 = 3
hence for 10 bulbs = 30 units.
 
hence total bill = 30*7.5 = 225
Vikas TU
14149 Points
one year ago
Dear arun , 
Have some sense , It is for one month 
1 BULB=20 WATT
10 BULB=200*10
             =20000 WATT OR 20KILOWATT
TIME=5HOURS
​ENERGY=POWER *TIME
                 20KW * 5 HRs
               =100KWH OR 100 UNITS
1 DAY ENERGY= 100 UNITS
30 DAYS ENERGY= 100 *30 = 3000 unit 
1UNIT=7.30 RUPEES
3000 UNIT = 21900 RUPEES
HOPE THIS HELP

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