Question

An electric lamp is marked 60 W, 230 V. The cost of 1 kilowatt hour of power is Rs. 1.25. The cost of using this lamp for 8 hours is

• A. Rs. 1.20
• B. Rs. 4.00
• C. Rs. 0.25
• D. Rs. 0.60

Answer 1

Answer: (D)

Rs. 0.60

Answer 2

Total energy consumed $= \frac{60 \times 8}{1000} = 0.48kWH$

So cost $= 0.48 \times 1.25 = 0.6Rs.$