1 dB corresponds to change in voltage or current level of

1 dB corresponds to change in voltage or current level of:

1. 1%
2. 12%
3. 25%
4. 32.5%

Correct answer: 2. 12%

Voltage or current gain in dB = 20 log₁₀ (V₂/V₁)

1 = 20 log₁₀ (V₂/V₁)

V₂/V₁ = 1.12

= (1.12 – 1)/1 * 100% = 12%

So a 1 dB corresponds to change in voltage or current level of 12%