Final answer:
The cost to run a microwave that draws 0.8 kW for one hour at a rate of 7.5 cents per kWh is $0.06.
Step-by-step explanation:
To calculate the cost of the microwave's electrical energy consumption, we first need to understand the power usage and the duration of its operation. The microwave uses 0.8 kW (800 Watts) and it has been used for one hour. Using the formula for energy consumption:
E (kWh) = P (kW) × T (hours)
Where:
- E is the energy in kilowatt-hours,
- P is the power in kilowatts,
- T is the time in hours.
We find that:
E = 0.8 kW × 1 hour = 0.8 kWh
Now, to find the cost:
Cost = E (kWh) × Cost per kWh
Cost = 0.8 kWh × $0.075 = $0.06
Therefore, the cost to run the microwave for one hour at 7.5 cents per kWh is $0.06.