What is the formula for Signal-to-Noise Ratio (SNR)?

The formula for Signal-to-Noise Ratio (SNR) is indeed derived from the relationship between the power of the signal and the power of the noise. SNR is a measure used to compare the level of the desired signal to the level of background noise. Expressing SNR as the ratio of signal power to noise power allows for an easy comparison of how much signal is distinguishable from the noise.

In this context, a higher SNR indicates a cleaner and clearer signal, which is desirable in most communication systems. This relationship is crucial in fields such as telecommunications and audio engineering, where understanding the clarity of the signal is essential for effective transmission and reception.

The other options suggest incorrect arithmetic operations that do not reflect the purpose of SNR, which is to quantify the relationship using division rather than addition or subtraction.