15.4.7.8.4. More efficient components

4.1: Power supply: Desktop computer power supplies (PSUs) are generally 70–75% efficient, dissipating the remaining energy as heat.

Power supplies in desktop computers convert AC (Alternating Current) from the wall into DC (Direct Current) which the computer's components need. Though modern power supplies are generally 70–75% efficient, this means that a significant portion (25–30%) of the energy consumed is lost as heat. This inefficiency not only wastes energy but also requires additional cooling, which can lead to further energy consumption. Hence, using more efficient power supplies can help in reducing total energy usage and costs.

Imagine filling a bucket with water, but for every liter of water you pour in, you only get 0.75 liters that actually fills the bucket, while the rest spills out onto the floor. In this example, the spilled water represents the energy lost as heat. By finding a better bucket that holds more water without leaking, you minimize waste, much like finding a power supply that uses energy more efficiently.

4.2: Storage: Smaller form factor (e.g. 2.5 inch) hard disk drives often consume less power than physically larger drives.

In computer systems, hard drives store data permanently. The size of the drives can significantly influence their power consumption. Smaller drives, such as the 2.5-inch hard disk drives (HDDs), are typically designed for laptops and are more power-efficient compared to larger drives used in desktop systems. They use less energy to operate, which can reduce overall energy consumption and lower electricity bills.

Think of two different-sized refrigerators. One is a tiny mini-fridge, and the other is a large standard fridge. The mini-fridge will likely use less electricity because it has a smaller cooling space. Similarly, smaller hard drives require less energy to run than their larger counterparts, making them a better choice for energy-conscious consumers.

4.3: Display: LCD monitors typically use a cold-cathode fluorescent bulb to provide light for the display. Some newer displays use an array of light-emitting diodes (LEDs) in place of the fluorescent bulb, which reduces the amount of electricity used by the display.

Traditional LCD monitors use cold-cathode fluorescent bulbs (CCFLs) for backlighting, which can consume more power compared to newer technologies. LED displays, on the other hand, use light-emitting diodes which are significantly more energy-efficient. Not only do LEDs provide better color accuracy and brightness, but they also consume less energy, leading to lower electricity costs and a smaller carbon footprint for users.

No real-life example available.