![]() 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. Consumers are often unaware of the cost of the energy used by electronic devices.
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