A 750 watt hair dryer is used 15 minutes. calculate the cost to use the hairdryer if it is used for 15 minutes. Everyday for a year and the energy cost is 10 cents per kWh
To calculate the cost to use the hairdryer for 15 minutes every day for a year, we need to determine the energy used in kWh and then multiply it by the energy cost.
Step 1: Convert the power from watts to kilowatts:
750 watts = 750/1000 = 0.75 kilowatts (kW)
Step 2: Calculate the energy used per day:
Energy used per day = Power x Time
Energy used per day = 0.75 kW x 15 minutes
Energy used per day = 0.75 kW x 0.25 hours (since there are 60 minutes in an hour)
Energy used per day = 0.1875 kWh
Step 3: Calculate the energy used per year:
Energy used per year = Energy used per day x 365 days
Energy used per year = 0.1875 kWh x 365 days
Energy used per year = 68.4375 kWh
Step 4: Calculate the cost:
Cost = Energy used per year x Energy cost per kWh
Cost = 68.4375 kWh x $0.10/kWh
Cost = $6.84
Therefore, the cost to use the hairdryer for 15 minutes every day for a year at an energy cost of 10 cents per kWh is $6.84.