Peoples Physics Book Version-3

26.1. Appendix A: Answers to Selected Problems (3e) http://www.ck12.org

1. 0.11 A

2. 1.0 W

3. 
   
   
   
   2. 5 × 1021 electrons
   
   
   
   


4. 3636 W


5. 192Ω


6. 0.42 W


7. 5.4 mV


8. 
   
   
   
   1. 4 × 10 −^8 A
   
   
   
   


9. 
   
   
   
   7. 3 × 10 −^11 W, not a lot
   
   
   
   


10. 
    
    
    
    2. 6 × 10 −^7 J
    
    
    
    


11. left = brighter, right = longer


12. 224 V


13. 448 W


14. 400 W by 100Ωand 48 W by 12Ω


15. b. 8.3 W


16. 0.5A
    5..


17. 0.8A and the 50Ωon the left


18. 0.94 A


19. 112 W


20. 0.35 A


21. 0.94 A


22. 50, 45 , 75 Ω


23. both 50Ωresistors are brightest, then 45Ω, then 75Ω


24. 0.76 A


25. 7.0 W


26. b. 1000 W
    8..


27. 
    
    
    
    9. 1 Ω
    
    
    
    


28. 
    
    
    
    29. 1 Ω
    
    
    
    


29. 
    
    
    
    10. 8 Ω
    
    
    
    


30. 
    
    
    
    26. 8 Ω
    
    
    
    


31. 1.8A


32. 21.5V


33. 19.4V


34. 6.1V


35. 0.24A


36. 16 kW


37. 
    
    
    
    3. 66 Ω
    
    
    
    


38. 0.36A


39. 1.32 V
    9..
    10..
    11..
    12..
    13..