Final answer:
Power savers can be effective by either reducing the power a device consumes or its operational time, especially for high-power, continuously running appliances.
Efficient devices, like compact fluorescent light bulbs, also contribute to energy savings. The effectiveness of power savers largely depends on the device and how they are utilized.
Step-by-step explanation:
When determining the effectiveness of a power saver, it's important to consider the energy consumption, which is the product of power and time. For example, high-power devices that run continuously, such as water heaters and air conditioners, will benefit most from power-saving strategies. The goal is to either reduce the power drawn by the device or limit the amount of time it’s in use.
Conversely, devices like toasters, despite drawing considerable power, are used only briefly and therefore represent a lesser opportunity for energy savings. Likewise, continuous-use devices with very low power requirements, such as electric clocks, have a negligible impact.
Selecting devices with higher efficiencies is another effective strategy. One example is the compact fluorescent light bulb, which offers superior lighting for less power compared to traditional incandescent bulbs. It is clear that the use of power savers, coupled with the strategic selection of more efficient appliances, can lead to substantial energy and cost savings over time.