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7. kirchhoff s_rules
7. kirchhoff s_rules
7. kirchhoff s_rules
7. kirchhoff s_rules
7. kirchhoff s_rules
7. kirchhoff s_rules
7. kirchhoff s_rules
7. kirchhoff s_rules
7. kirchhoff s_rules
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7. kirchhoff s_rules

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Transcript

  • 1. Kirchhoff’s Rules
  • 2. Kirchoff’sRules: Junction Rule
    • The algebraic sum of the currents into any junction is zero.
    • 3. A junction is an intersection of three or more conductors.
  • Kirchoff’sRules: Junction Rule
    • The algebraic sum of the currents into any junction is zero.
    • 4. I = 0 ( at any junction )
    • 5. I is + when it enters a junction.
    • 6. I is - when it enters a junction.
    • 7. I = 0
    • 8. I1 + I2 - I3= 0
    • 9. I1 + I2 = I3
    I3
  • 10. Kirchoff’sRules: Loop Rule
    • 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. A loop is any closed conducting path.
    • 12. V = 0 ( at any loop)
    • 13. 3 loops
  • Kirchoff’sRules: Loop Rule
    • Sign convention for V:
    +V
    -V:
    • electron flow
  • Examples:
    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.
    -
    +
    I
    -
    +
    I
    I
    I
    +
    -
    I
    -
    +
  • 14. Examples:
    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 )
    V=?
    a
    b
  • 15. Examples:
    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.)
    V1=?
    V2=?
  • 16. ---FIN--- 

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