Question
Two voltage measurements made across the same resistance are $V_{1}=110 \mathrm{~V}$ and $V_{2}=220 \mathrm{~V}$. Calculate the power gain in decibels of the second reading over the first reading.
Step 1
We can use the formula for power, which is P = V^2 / R, where P is power, V is voltage, and R is resistance. Since the resistance is the same for both readings, we can just compare the squares of the voltages. Power ratio = (V2^2) / (V1^2) = (220^2) / (110^2) = Show more…
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