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Understand circuit diagrams, brightness of bulbs, current flow, power dissipation, and resistivity in electrical circuits with clear explanations and questions.

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  1. Previous Stuff

  2. more dc circuits February 15, 2010

  3. Which diagram ain’t right? A B C

  4. Which bulbs in the diagram will light? • All lights will light. • A and B will light • A and C will light • B and C will light • None of these answers are correct. B C A It is the same diagram that is on the handout.

  5. A steady current flows through the wire shown below. At one point, the wire suddenly narrows. Which of the following is correct? I A B A I(A)=I(B) B I(A)<I(B) C I(A)>I(B) D None of the above

  6. Which bulb do you think is brighter? • A • B • C • All the same B C A

  7. A current I flows through a device. The difference in potential from one side of the device to the other is V. How much POWER is dissipated in the device?

  8. Resistance February 17, 2010 Resistivity

  9. Measuring Voltage Set to proper scale Resistivity

  10. Measure current Set to proper scale Resistivity

  11. But First … a few clicks Resistivity

  12. Which lamp is brighter? • A • R1 on the left • R2 on the right • Both the same

  13. Where is the current largest? A Point A B Point B C Point C D They are all the same B C A Resistivity

  14. CURRENT IS NEVER USED UP! Resistivity

  15. REMEMBER - Resistivity

  16. Which bulb is brighter? • R1 on the top • R2 on the bottom • Both the same

  17. The two batteries and all of the resistors (light bulbs) have the same values. Which light bulb is brighter? A Bulb A is Brighter B Bulb B is brighter C Both are the same A BB B

  18. which has more current? Normal Wire High Resistance Wire (W) A B C They are the same. Resistivity

  19. which has more current? Normal Wire High Resistance Wire (W) A B C They are the same. Resistivity

  20. which has more current? Normal Wire High Resistance Wire (W) A B C They are the same. Resistivity

  21. Resistivity

  22. Resistance February 17, 2010 Resistivity

  23. Get Moving on these *@&^ing WebAssigns! Resistivity

  24. What? A Quiz? Noooo… Resistivity

  25. which has more current? Normal Wire High Resistance Wire (W) A B C They are the same. Resistivity

  26. Resistance increases with length. Resistivity

  27. which has more current? Normal Wire High Resistance Wire (W) A B C They are the same. Resistivity

  28. which has more current? Normal Wire High Resistance Wire (W) A B C They are the same. Resistivity

  29. Resistance inverse to area. • r is resistivity units=W-m • 1/r=s=conductivity • r is a property of the material Resistivity

  30. Resistivity W-m Resistivity

  31. A wire has a resistance of R Ω. It is melted down, and from the same volume of metal a new wire is made that is two times longer than the original wire. What is the resistance of the new wire? Idea: What stays the same?? VOLUME! Resistivity

  32. What is the resistance A-b? Resistivity

  33. That’s why you pay tuition .. isn’t it?? Resistivity

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