Question

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)​

Answer 1

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