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A power amplifier has an input of 90mV across 10K ohm. The outputis 7.8V across an 8 ohm speaker. What is the power gain in dB?

A power amplifier has an input of 90mV across 10K ohm. The outputis 7.8V across an 8 ohm speaker. What is the power gain in dB?

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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power gain(dB)= 10log P output/ P input But instead of 10 log you wrote 20 why please Thank you
9:45 ◄ Safari Step2 b) Solution, Output power, Po= Vo² = (7.8)2 = 7.605w. Ro 8 Input power, Pi= v₁² = (gox103) e Ri 10 x 103 Pi= 8.1 x 107 watt Power gain = Po Pi =7.605 Q 8.1x/0-7 =9388888.889 Power gain Power gain (dB) = 20log (93888888) Power gain = 139.452dB (dB) LTE 954 ? vx DO
Transcribed Image Text:9:45 ◄ Safari Step2 b) Solution, Output power, Po= Vo² = (7.8)2 = 7.605w. Ro 8 Input power, Pi= v₁² = (gox103) e Ri 10 x 103 Pi= 8.1 x 107 watt Power gain = Po Pi =7.605 Q 8.1x/0-7 =9388888.889 Power gain Power gain (dB) = 20log (93888888) Power gain = 139.452dB (dB) LTE 954 ? vx DO
9:45 ◄ Safari ← ✓ ANSWERED Saturday, Jun 18, 2022 ENGINEERING ELECTRICAL-ENGINEERING A power amplifier has an input of 90mV across 10K ohm. The outputis 7.8V across an 8 ohm speaker. What is the power gain in dB? Expert Answer Step1 a) Power gain Ap= Output power: f Input power = Pi Power gain (dB) = 20 log (PPT) Power = √² v² R .llLTE 954 Q @ √x DO
Transcribed Image Text:9:45 ◄ Safari ← ✓ ANSWERED Saturday, Jun 18, 2022 ENGINEERING ELECTRICAL-ENGINEERING A power amplifier has an input of 90mV across 10K ohm. The outputis 7.8V across an 8 ohm speaker. What is the power gain in dB? Expert Answer Step1 a) Power gain Ap= Output power: f Input power = Pi Power gain (dB) = 20 log (PPT) Power = √² v² R .llLTE 954 Q @ √x DO
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