2A धारावाही 5-ओम के प्रतिरोधक में अपव्ययित शक्ति कितनी है?

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RRB ALP Electronics Mechanic 21 Jan 2019 Official Paper (Shift 3)
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  1. 10 W
  2. 0.6 W
  3. 2.5 W
  4. 20 W

Answer (Detailed Solution Below)

Option 4 : 20 W
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अवधारणा :

  • शक्ति: विद्युत धारा द्वारा किए गए कार्य की दर को शक्ति कहा जाता है। इसे P द्वारा निरूपित किया गया है। शक्ति की SI इकाई वाट (W) है।

शक्ति अपव्यय निम्न द्वारा दिया जाता है:

शक्ति (P) = V I = V2/R = I2 R

जहां V प्रतिरोध के पार विभवांतर है, I प्रवाहित धारा है और R प्रतिरोध है।

गणना :

दिया हुआ है कि:

प्रतिरोध (R) = 5 Ω 

धारा (I) = 2 A

शक्ति (P) = IR = 22 × 5 = 20 W

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