Five 80w and 3 100w lamps that run for 8 hours. If the cost of running is 5naira calculate the coat of running the lamp
First, we need to calculate the total energy consumption of the lamps in a day:
Total energy consumption = (5 lamps x 80w) + (3 lamps x 100w)
Total energy consumption = (400w) + (300w)
Total energy consumption = 700w
Now, we need to convert the energy consumption to kilowatt-hours (kWh) because the cost is given per kWh:
Total energy consumption in kWh = (700w x 8 hours) / 1000
Total energy consumption in kWh = 5.6 kWh
Now, we need to calculate the cost of running the lamps for a day:
Cost of running = Total energy consumption in kWh x Cost per kWh
Cost of running = 5.6 kWh x 5 naira
Cost of running = 28 naira
Therefore, the cost of running the lamps for 8 hours is 28 naira.