The cost of electrical energy is typically expressed in terms of the unit of energy consumed and the rate at which you are charged for that energy. The common unit of energy used for billing purposes is the kilowatt-hour (kWh), and the cost is usually expressed in terms of currency per kWh. Here's how the expression for the cost of electrical energy would look:
Cost of Electrical Energy (in currency) = Energy Consumed (in kWh) Ă Rate (currency per kWh)
Where:
Energy Consumed: This is the total amount of electrical energy used, measured in kilowatt-hours (kWh). It represents the sum of power consumed over a specific period of time.
Rate: This is the cost per kilowatt-hour, often referred to as the "electricity rate" or "unit price." It is the amount you are charged for every kilowatt-hour of energy you use.
For example, if you consume 100 kWh of electricity at a rate of $0.10 per kWh, the cost of electrical energy would be:
Cost = 100 kWh Ă $0.10/kWh = $10.00
Keep in mind that electricity rates can vary based on factors such as location, time of day (with some areas having different rates for peak and off-peak hours), and the type of customer (residential, commercial, industrial). Additionally, some places might have additional charges or fees that could affect the final cost.
It's always a good idea to refer to your electricity bill or contact your utility provider to get accurate information about the specific rates and charges in your area.