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Unformatted text preview: Capacitive DC Circuits Kirchhoff’s laws can also be used to analyze circuits employing capacitors instead of resistors. This provides good practice with the method since the only significant difference is that it involves charge building up on capacitors rather than current flowing through resistors. Of course, the voltage term IR for resistors must also be replaced by the Q/C for capacitors, but otherwise it is very much the same. For the example circuit below, two arbitrary loops have been added called Q ₁ and Q ₂ . While these are not really flowing, they perform the usual function of helping us track voltages correctly. As always, it is convenient to place the loops so that they go the same direction through the branch they share. Following the first loop from the lower left corner of the circuit, the path takes us to the negative side of the battery before the positive side, so the voltage change will be -5 . Next comes the 20F capacitor with a charge Q ₁ on it, so the term is...
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This note was uploaded on 04/05/2012 for the course PHYS 131 taught by Professor Tibbets during the Spring '11 term at Cuyamaca College.
- Spring '11