Final answer:
To calculate the cost of running an electrical heater for 4 hours at 0.15 kW-h, multiply the total energy consumed by the cost per kW-h, resulting in a cost of $0.072 if electricity is priced at 12 cents per kW-h.
Step-by-step explanation:
The student has asked about the cost of running an electrical heater that consumes 0.15 kW-h for 4 hours. To calculate this, the energy consumption in kW-h must be multiplied by the cost per kW-h. Assuming the cost of electricity is the same as one of the examples provided, at 12 cents per kW-h, the calculation would be:
Energy Consumption = Power (in kW) × Time (in hours) = 0.15 kW × 4 hours = 0.6 kW-h
Cost = Energy Consumption (in kW-h) × Cost per kW-h = 0.6 kW-h × $0.12/kW-h = $0.072
Therefore, the cost of running the heater for 4 hours would be $0.072.