Question

Two electric bulb rated 60w and 40w are used 5hours per day for 20days cost of unit rs4.00 find the cost of the energy used

Answer 1

POWER USED PER DAY = 60/1000 * 5  = 0.3 kWh

                                         = 40/1000* 5  = 0.2 kWh

For 20 days = 20 * (0.3+0.2) = 10 kWh

cost = 4* 10

Rs.40

Answer 2

Answer:

Explanation:POWER USED PER DAY = 60/1000 * 5 = 0.3 kWh

= 40/1000* 5 = 0.2 kWh

For 20 days = 20 * (0.3+0.2) = 10 kWh

cost = 4* 10

Rs.40