Question

An electric refrigerator rated 400 W operates 8 hour/day. What is
the cost of the energy to operate it for 30 days at Rs 3.00 per kWh?​

Answer 1

Answer:

total energy consumed in 30 days would be,

$= > 400w \times 8.0 \times 30$

$= > 96000wh$

$= > 96kwh$

thus,

the cost of energy to operate refrigerator,

$96 \times 3.00$

$= > rs \: \: 288.00$

Answer 2

Explanation:

Power = P = 400W = 400/1000 kW = 0.4 kW

Total time for which the refrigerator operated = t = 8 hours x 30 days = 240 h

Since, Energy consumed = P x t E = 0.4 x 240 kWh = 96 kWh

Therefore, total cost required to operate the refrigerator for the month = 96 x 30 = 2880 INR.