How much does it cost to operate a 28-W porch light for 24 h if electric energy costs 8¢/ kWh .
28 * 24 = ? Wh
8¢/ kWh = .008¢/ Wh
cost = Wh * .008¢/ Wh
0.028kW * 24h = 0.672 kWh.
Cost = 0.672kWh * 0.08/kWh = 0.054 = 5.4 cents.
Well, looks like someone is shedding some light on their electricity bill! Let me calculate that for you.
So, we have a 28-Watt porch light running for 24 hours. To convert the power from watts to kilowatts (kW), we divide it by 1000. Therefore, the porch light consumes 0.028 kWh per hour (28 W / 1000).
Now, we multiply this energy consumption per hour by the number of hours the porch light is on (24 hours) to obtain the total energy consumption for the day:
0.028 kWh/hour * 24 hours = 0.672 kWh
Now, let's calculate the cost. Since the electric energy costs 8¢ per kilowatt-hour, we multiply the total energy consumption by the cost per kilowatt-hour:
0.672 kWh * $0.08/kWh = $0.05376
So, you can expect to pay approximately 5 cents and a chuckle for running your porch light for 24 hours. Keep an eye on those pennies and find other reasons to laugh!
To calculate the cost of operating a 28-W porch light for 24 hours, we need to determine the energy consumption in kilowatt-hours (kWh) and then multiply it by the cost per kWh. Here's how you can do it step-by-step:
Step 1: Convert the wattage to kilowatts:
28 W = 28 ÷ 1000 = 0.028 kW
Step 2: Calculate the total energy consumption in kWh:
Energy consumption = Power (kW) × Time (h)
Energy consumption = 0.028 kW × 24 h = 0.672 kWh
Step 3: Determine the cost:
Cost = Energy consumption (kWh) × Cost per kWh
Cost = 0.672 kWh × $0.08/kWh
Cost ≈ $0.05376
Therefore, it would cost approximately $0.05376 to operate a 28-W porch light for 24 hours if electric energy costs 8¢/kWh.
To determine the cost of operating a 28-W porch light for 24 hours, we need to calculate the total energy consumed by the light and then multiply it by the cost of electricity per kilowatt-hour (kWh).
First, we need to convert the power of the porch light from watts to kilowatts. Since 1 kilowatt (kW) is equal to 1000 watts (W), we divide 28 W by 1000:
28 W / 1000 = 0.028 kW
Next, we calculate the energy consumption of the porch light by multiplying its power by the amount of time it is operated:
0.028 kW * 24 hours = 0.672 kWh
Finally, we multiply the energy consumption by the cost of electricity per kilowatt-hour:
0.672 kWh * $0.08/kWh = $0.05376
Therefore, it would cost approximately $0.05376 to operate a 28-W porch light for 24 hours, assuming the electricity cost is $0.08/kWh.