116k views
2 votes
A man has a 40watts and two 60 watt bulb in a room. how much will it cost him to keep them light for 8 hrs, if the cost of a unit in kWh is 50 kobo​

1 Answer

1 vote

Answer: 64 kobos for 8 hours

Step-by-step explanation:

To calculate the cost of running the bulbs for 8 hours, we need to first determine the total energy consumed by the bulbs.

Energy consumed by the 40-watt bulb in 8 hours = 40 watts * 8 hours = 320 watt-hours

Energy consumed by one of the 60-watt bulbs in 8 hours = 60 watts * 8 hours = 480 watt-hours

Total energy consumed by the two 60-watt bulbs in 8 hours = 2 * 480 watt-hours = 960 watt-hours

Total energy consumed by all three bulbs in 8 hours = 320 + 960 = 1280 watt-hours = 1.28 kilowatt-hours (kWh)

Now, to calculate the cost of running the bulbs for 8 hours, we need to multiply the total energy consumed (1.28 kWh) by the cost of one unit (50 kobo).

Cost of running the bulbs for 8 hours = 1.28 kWh * 50 kobo/kWh = 64 kobo

Therefore, it will cost him 64 kobos to keep the bulbs lit for 8 hours

User Flopga Slays
by
7.9k points