tölvunaraflsþáttum

Tölvunaraflsþáttur, often referred to as a computer power factor, is a measure of how effectively a computer's power supply unit (PSU) converts alternating current (AC) power from the wall outlet into direct current (DC) power usable by the computer's components. It is a ratio of the real power consumed by the computer (measured in watts) to the apparent power drawn from the AC source (also measured in watts, but representing the total power delivered). A power factor of 1.0 (or 100%) indicates perfect efficiency, meaning all the apparent power is converted to real power.

In reality, perfect power factors are rarely achieved in typical consumer electronics. The power factor of a computer's PSU is influenced by its design, particularly the presence and quality of a power factor correction (PFC) circuit. Active PFC circuits are more effective than passive PFC circuits, achieving power factors closer to 1.0. A higher power factor is desirable for several reasons. It reduces the reactive power drawn from the grid, which can lead to less strain on electrical infrastructure and potentially lower electricity bills for consumers. It also helps to minimize harmonic distortion, which can interfere with other electronic devices.

Modern computer power supplies, especially those designed for gaming or professional workstations, increasingly incorporate active PFC circuits to meet regulatory requirements and improve energy efficiency. When purchasing a PSU, checking its power factor rating can be an indicator of its quality and efficiency.