एक शक्ति प्रवर्धक 4 Ω स्पीकर भार को 25 वाट की ए.सी. शक्ति प्रदान करता है। यदि डी.सी. इनपूट शक्ति 40 वाट है, तो इस प्रवर्धक की दक्षता क्या है?

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KVS TGT WET (Work Experience Teacher) 23 Dec 2018 Official Paper
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  1. 78.6%
  2. 25%
  3. 62.5%
  4. 160%

Answer (Detailed Solution Below)

Option 3 : 62.5%
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संकल्पना:

शक्ति प्रवर्धक की दक्षता निम्न द्वारा दी गई है;

\(η= \frac{P_{0}}{P_{i}}\times 100\)

जहाँ;

η = दक्षता 

P0 = आउटपूट AC शक्ति 

Pi = इनपूट DC शक्ति 

गणना:

दिया गया है;

P0 = आउटपूट AC शक्ति =25 W

Pi = इनपूट DC शक्ति = 40 W

तब;

\(η= \frac{P_{0}}{P_{i}}\times 100 = \frac{25}{40}\times 100 =62.5\,%\)

 

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