the following electric items are used daily in a house:i tv of 100 w for 2 hours,i fridge of 120 w for 24 hours,3 fluoresent tubes of 40 w for 4 hours,2 bulbs of 60 w each for 2 hours and 1 iron of 1000 w for half an hour.what is the bill for 1 month of power @3.00 per unit

Asked by deepa1122 | 31st May, 2015, 04:55: PM

Expert Answer:

begin mathsize 14px style Given space that colon  bold For bold space bold television colon Power comma space straight P space equals space 100 space straight W Time comma space straight t space equals 2 space hrs Electrical space energy space consumed space equals space straight P cross times straight t equals 100 space straight W cross times 2 space straight h equals 200 space Wh space equals 0.2 kWh  bold For bold space bold Fridge bold colon Power comma space straight P space equals space 120 space straight W Time comma space straight t space equals 24 space hrs Electrical space energy space consumed space equals space straight P cross times straight t equals 120 space straight W cross times 24 space straight h equals 2880 space Wh space equals 2.9 kWh  bold For bold space bold fluorescent bold space bold tubes bold colon Power comma space straight P space equals space 40 space straight W Time comma space straight t space equals 4 space hrs Electrical space energy space consumed space equals space straight P cross times straight t equals 40 space straight W cross times 4 space straight h equals 160 space Wh space equals 0.16 kWh For space three space tubes comma space the space electrical space energy space consumed space equals 3 cross times 0.16 space kWh equals 0.48 space kWh  bold For bold space bold bulbs bold colon Power comma space straight P space equals space 60 space straight W Time comma space straight t space equals 2 space hrs Electrical space energy space consumed space equals space straight P cross times straight t equals 60 space straight W cross times 2 space straight h equals 120 space Wh space equals 0.12 kWh For space two space bulbs comma space the space electrical space energy space consumed space equals 2 cross times 0.12 space kWh equals 0.24 space kWh  bold For bold space bold Iron bold colon Power comma space straight P space equals space 1000 space straight W Time comma space straight t space equals 0.5 space hrs Electrical space energy space consumed space equals space straight P cross times straight t equals 1000 space straight W cross times 0.5 space straight h equals 500 space Wh space equals 0.5 kWh  Total space energy space consumed space equals 0.2 space kWh space plus 2.9 kWh space plus 0.48 space kWh space plus 0.24 space kWh space plus 0.5 space kWh equals 4.32 space kWh For space one space month space total space energy space consumed space equals 4.32 cross times 30 equals 129.6 space kWh Total space cost space equals 129.6 cross times 3.00 space equals 388.8 space Rs  end style

Answered by Jyothi Nair | 1st Jun, 2015, 09:37: AM

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