![]() Department of Energy figures), but you may be paying 36 cents or more for each additional kWh! To determine your rates, look at your electric bill or check your utility company's website. national average residential rate is about 11.5 cents per kWh (November 2008 U.S. It is the amount that you will save when you reduce your usage. That is how much you pay for each kWh that you add or subtract from your present usage. You should calculate costs at your highest usage rate (i.e., your highest "tier"). Some utilities even charge by time of day, with lower rates during off-peak hours. ![]() Residential rates are often "tiered." The more you use, the more you pay. In most communities, energy costs are not constant. Different operating modes (e.g., operating and standby).How many hours a day the device operates.Differences between labeled and actual power.Total energy cost = (Power in watts/1000) × hours operating × cost per kWhĪnalog Devices' Energy Cost Calculator makes the calculation even easier. Multiply that value by the cost per kWh, and you have the total energy cost. The unit of electrical energy is the kilowatt-hour (kWh), found by multiplying the power use (in kilowatts, kW) by the number of hours during which the power is consumed. Calculating Energy CostsĪs every engineer knows, energy calculation is straightforward. It is clear that we can save ourselves and our customers money if we make good design choices for the environment-often without much sacrifice. Knowing the cost of energy usage will drive conservation. In just over a year, the device cost him more in power than its purchase price! As consumers and engineers, we wonder whether the designers of these devices are seriously considering end users' energy costs. Our CEO was surprised to discover that a media server in his home was costing $473 (U.S. But the smaller devices, the ones that run most of the day, may actually be secretly consuming high volumes of energy! In the office, we think about lights, desktop computers, and factory equipment. As consumers, we naturally think of large appliances such as the refrigerator and furnace. Step one is awareness: think about saving power. "Watts we don't use" are always the cheapest power source and far less costly than building new power plants, whether those new plants are conventional or use alternative energy sources. Why Monitoring Energy Use Is ImportantĮxperts agree that the most powerful tactic to address climate change, pollution, and energy consumption is to reduce the energy that we use. This application note discusses how to calculate energy costs accurately, and presents an online calculator that makes the calculation even easier. In fact, the electricity cost often exceeds the equipment's purchase price within a year! Simple calculations reveal the energy costs of a device and encourage conservation. Using a low energy portable fan instead of an air conditioner may also help save you money.Consumers are often unaware of the cost of the energy used by electronic devices. Taking cold showers, drinking cool drinks and wearing lighter clothing during hot weather may allow you to decrease your air conditioner reliance. ![]() Close windows in your home if you are using an air conditioner, to avoid leaking cold air and making your cooling inefficient. If you are in the market for a room air conditioner make sure you get one that is energy efficient and appropriate for your room or apartment. To find an exact price check your electricity bill or take a look at Global Electricity Prices.ĭecreasing the use of an air conditioner will help lower costs, cooling is generally expensive and there are not many options to save money without increasing your temperature. Price (kWh): Enter the cost you are paying on average per kilowatt hour, our caculators use the default value of 0.10 or 10 cents. Power Use (Watts): Enter the average power consumption of the device in watts. Hours Used Per Day: Enter how many hours the device is being used on average per day, if the power consumption is lower than 1 hour per day enter as a decimal.
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