Ham Radio General Class Practice Test 2025 – Complete Exam Prep

Question: 1 / 545

What percentage of power loss would result from a transmission line loss of 1 dB?

10.9%

12.2%

20.5%

To understand the relationship between decibels (dB) and power loss, it's essential to grasp that a 1 dB loss indicates a certain ratio of power reduction. In electrical terms, the formula to convert dB to a power ratio is given by:

\[

\text{Power Ratio} = 10^{\left(\frac{\text{loss in dB}}{10}\right)}

\]

For a 1 dB loss:

\[

\text{Power Ratio} = 10^{\left(\frac{1}{10}\right)} \approx 1.2589

\]

This means that the output power is approximately 1.2589 times the input power. To find the percentage of power that is actually lost, we can relate it to the remaining power:

\[

\text{Remaining Power} = \frac{P_{out}}{P_{in}} = \frac{1}{1.2589} \approx 0.7937

\]

This indicates that about 79.37% of the power is retained after the loss. To find the percentage of power that is lost:

\[

\text{Power Lost} = 100\% - 79.

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25.9%

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