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Direct Current QA 9

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Lakshmikanta Satapathy
Lakshmikanta Satapathy

JEE Physics/ Lakshmikanta Satapathy/ Direct Current QA part 9/ Question on Power consumed by an external resistance connected across a parallel combination of two identical cells

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Physics Helpline L K Satapathy Direct Current - 9 Power consumed by External Resistance rE R rE
Physics Helpline L K Satapathy Direct Current - 9 Cells in Parallel Question : Two identical cells, each of emf 2 V and internal resistance 1  are connected to an external resistance R = 0.5  as shown in the figure. Then the power consumed by the resistance R is (a) 0.9 W (b) 1.25 W (c) 1.75 W (d) 2 W 12V 0. 5 R 12V Answer : When two identical cells each of emf E and internal resistance r are connected in parallel across an external resistance R , then the net emf = E Total internal resistance 2 r  External resistance = R  Total circuit resistance 2 r R   Circuit current 2 2 2 E E I r R rR    E E r r R
Physics Helpline L K Satapathy Direct Current - 9 Cells in Parallel Correct option = (d) Given: E = 2 V and r = 1  The two cells are in parallel  The net emf = 2 V Total internal resistance 0.5 2 r    0.52V 0.5 Total circuit resistance 0.5 0.5 1     Current through external resistance 2 2 1 I A   Power consumed by external resistance 2 4 0.5 2P I R W    External resistance 0.5 
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Direct Current QA 9

  • 1. Physics Helpline L K Satapathy Direct Current - 9 Power consumed by External Resistance rE R rE
  • 2. Physics Helpline L K Satapathy Direct Current - 9 Cells in Parallel Question : Two identical cells, each of emf 2 V and internal resistance 1  are connected to an external resistance R = 0.5  as shown in the figure. Then the power consumed by the resistance R is (a) 0.9 W (b) 1.25 W (c) 1.75 W (d) 2 W 12V 0. 5 R 12V Answer : When two identical cells each of emf E and internal resistance r are connected in parallel across an external resistance R , then the net emf = E Total internal resistance 2 r  External resistance = R  Total circuit resistance 2 r R   Circuit current 2 2 2 E E I r R rR    E E r r R
  • 3. Physics Helpline L K Satapathy Direct Current - 9 Cells in Parallel Correct option = (d) Given: E = 2 V and r = 1  The two cells are in parallel  The net emf = 2 V Total internal resistance 0.5 2 r    0.52V 0.5 Total circuit resistance 0.5 0.5 1     Current through external resistance 2 2 1 I A   Power consumed by external resistance 2 4 0.5 2P I R W    External resistance 0.5 
  • 4. Physics Helpline L K Satapathy For More details: www.physics-helpline.com Subscribe our channel: youtube.com/physics-helpline Follow us on Facebook and Twitter: facebook.com/physics-helpline twitter.com/physics-helpline