Question

What is the monthly energy cost to operate a 85-watt PAR38 incandescent lamp? Electricity costs $0.13 per kW-hr and the lamp will be ON for 13 hours per day. There are 30 days in a billing month.What is the monthly energy cost to operate a 85-watt PAR38 incandescent lamp? Electricity costs $0.13 per kW-hr and the lamp will be ON for 13 hours per day. There are 30 days in a billing month.

Answer 1

The monthly energy cost to operate an 85-watt PAR38 incandescent lamp for 13 hours per day at $0.13 per kWh and for 30 days in a month is $4.31.

Step-by-step explanation:

The question asks to calculate the monthly energy cost to operate an 85-watt PAR38 incandescent lamp, given that electricity costs $0.13 per kWh, and the lamp is on for 13 hours per day over a 30-day billing period.

To find the monthly energy cost, first calculate the daily energy consumption of the lamp:

• Daily energy consumption (kWh) = (85 watts * 13 hours) / 1000 = 1.105 kWh.

Next, calculate the monthly energy consumption:

• Monthly energy consumption (kWh) = 1.105 kWh/day * 30 days = 33.15 kWh.

Finally, calculate the monthly cost:

• Monthly cost = 33.15 kWh * $0.13/kWh = $4.31.

The significance of considering energy costs is highlighted by the cost savings when choosing more energy-efficient bulbs. For example, an LED bulb can save a substantial amount over an incandescent bulb over its much longer lifespan.