Question

An electric iron draws a current of 15 A from a 220 V supply, What is the cost of using iron for 30 min everyday for 15 days if the cost of unit (1 unit =1 kWhr) is 2 rupees ?

• A. Rs 49.5
• B. Rs 60
• C. Rs 40
• D. Rs 10

Answer 1

Answer: (A)

Rs 49.5

As we know that power(P)=v$\times$I
so P=15$\times$220=3300 watt
cost per unit=2 rupees
therefore,$\frac{3300\times 2\times 15\times 30}{60\times 1000}$=49.5 rupees.