A 240 V cloth dryer draws a current of 15 A. How much energy in kWh and joules, does it use in 45 minutes operation? How much will be the cost at the rate of Rs.1.45 per unit of electric energy?
Answers
Total energy in kWh will be 9720 and total cost will be Rs.14094
Explanation:
We have given voltage V = 240 volt
Current is given by i = 15 A
We know that power is given by
Power = voltage × current
So power P = 240×15 = 3600 watt
Time is given as t = 45 minutes = 45×60 = 2700 sec
We know that energy is given by
Energy = power × time = 3600×2700 = 9720000 watt-hour = 9720 kWh
We have given cost per kWh is Rs.1.45 per unit
We know that 1 unit = 1 kWh
So total cost will be = 9720×1.45 = Rs.14094
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