An electric iron draws a current of 15A from a220V supply. What is the cost of using iron for 30 min. everyday 15 days if the cost of unit is 2 rupees?(1 unit =kWh)
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p=v×i
p=220×15
p=3300W
p=3.3kW
t=30min=0.5hr
t=0.5×15
t=7.5hrs
unit = kW× hr
unit= 3.3×7.5
energy =24.75 units
cost = 2 ×unit
cost = 2× 24.75
cost =49.5 Rs
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