7. kirchhoff s_rules

1,297 views
1,139 views

Published on

Published in: Technology, Business
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
1,297
On SlideShare
0
From Embeds
0
Number of Embeds
7
Actions
Shares
0
Downloads
50
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

7. kirchhoff s_rules

  1. 1. Kirchhoff’s Rules<br />
  2. 2. Kirchoff’sRules: Junction Rule<br /><ul><li>The algebraic sum of the currents into any junction is zero.
  3. 3. A junction is an intersection of three or more conductors.</li></li></ul><li>Kirchoff’sRules: Junction Rule<br /><ul><li>The algebraic sum of the currents into any junction is zero.
  4. 4. I = 0 ( at any junction )
  5. 5. I is + when it enters a junction.
  6. 6. I is - when it enters a junction.
  7. 7. I = 0
  8. 8. I1 + I2 - I3= 0
  9. 9. I1 + I2 = I3</li></ul>I3<br />
  10. 10. Kirchoff’sRules: Loop Rule<br /><ul><li>The algebraic sum of the potential differences or voltages in any loop, including those associated with emfs and those of resistive elements, must equal zero.
  11. 11. A loop is any closed conducting path.
  12. 12. V = 0 ( at any loop)
  13. 13. 3 loops</li></li></ul><li>Kirchoff’sRules: Loop Rule<br /><ul><li>Sign convention for V:</li></ul>+V<br />-V:<br /><ul><li>electron flow</li></li></ul><li>Examples:<br />1. The circuit shown contains two batteries, each with a voltage and an internal resistance, and two resistors. Find: (a) the current in the circuit and (b) the potential difference Vab.<br />-<br />+<br />I<br />-<br />+<br />I<br />I<br />I<br />+<br />-<br />I<br />-<br />+<br />
  14. 14. Examples:<br />2. In the circuit shown, find: (a) the current in resistor R; (b) the resistance R; (c) the unknown voltage V and (d) if the circuit is broken at point x, what is the current in resistor R? (Ans. (a)2.00 A, (b) 5.00 , (c) 42.0 V, (d) 3.5 A )<br />V=?<br />a<br />b<br />
  15. 15. Examples:<br />3. Find the voltages V1 and V2 in the circuit below and find the potential difference of point b relative to a. (Ans. V1=18.0 V, V2=7.00 V, Vba=-13.0V.)<br />V1=?<br />V2=?<br />
  16. 16. ---FIN--- <br />

×