A decrease in power level is measured in decibels. This measurement is commonly referred to as:

The measurement of a decrease in power level in decibels is known as attenuation. Attenuation describes the reduction in signal strength or power as it travels through a medium, which is crucial in fields like telecommunications and audio engineering. When signal strength diminishes, it is quantified in decibels to allow for a standardized comparison of signal loss over distance or through various components.

Understanding attenuation is vital for technicians as it helps assess and manage signal integrity in electronic systems. This concept is particularly significant in scenarios where signals must travel long distances or pass through different types of equipment, as greater attenuation can lead to degradation of the original signal quality.

The other terms relate to different concepts within electronics. Amplification refers to increasing the power level of a signal, gain typically indicates the ratio of output power to input power (a non-negative measurement), and resistance is a measure of how much a component opposes current flow. Thus, while these terms are relevant in electronics, they do not specifically pertain to the decrease in power level that is encapsulated by the term attenuation.