the cost of operating an appliance varies jointly as the number of watts drawn, the hours of operation and the cost per kilowatt-hour. P8.99 per kilowatt-hour, how much would it cost when a 70-watt desk fan operates for 2 hours
though i don’t have the answer, please take time to read this <3
“Casting all your anxieties on him, because he cares for you.“ - 1 Peter 5:7
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P8.99/kwh * 70w * 2hr * 1kwh/1000w-hr = P1.2586
To calculate the cost of operating an appliance, which varies jointly as the number of watts drawn, the hours of operation, and the cost per kilowatt-hour, you will need to multiply these three factors.
In this case, the appliance is a 70-watt desk fan, which operates for 2 hours.
Step 1: Calculate the total watts consumed
The wattage of the appliance is 70 watts, and it operates for 2 hours. Therefore, the total watts consumed by the appliance can be calculated by multiplying the wattage with the hours of operation:
Total watts consumed = 70 watts x 2 hours = 140 watt-hours or 0.14 kilowatt-hours (since 1 kilowatt-hour = 1000 watt-hours).
Step 2: Calculate the cost of operating the appliance
The cost per kilowatt-hour is given as P8.99 (assuming "P" denotes the currency).
To calculate the cost of operating the appliance, multiply the total kilowatt-hours consumed with the cost per kilowatt-hour:
Cost of operating the appliance = 0.14 kilowatt-hours x P8.99 per kilowatt-hour.
Calculating this multiplication gives us the following result:
Cost of operating the appliance = 0.14 kilowatt-hours x P8.99 = P1.2586.
Therefore, it would cost approximately P1.26 (rounded to the nearest cent) to operate the 70-watt desk fan for 2 hours, given a cost of P8.99 per kilowatt-hour.