# Voltagedropacrossisiri reffective r1 r2 r3

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Unformatted text preview: gs along those lines? • Altgeld people: Sorry. Look for an email from me about what we will do. Key Concepts: 1) Understanding Kirchoff’s Rules 2) Using Kirchoff’s Rules Today’s Plan: Today’s Plan: • Summary of Kirchoff’s rules • Example problem • Review Preflights Last Time Resistors in series: Current through is same. Voltage drop across is IRi Reffective = R1 + R2 + R3 + ... Resistors in parallel: 1 Voltage drop across is same. Reffective Current through is V/Ri Solved Circuits R2 R1 V 1 1 1 =+ + + ... R1 R2 R3 = R3 V I1234 R1234 R4 5 New Circuit R1 R3 V1 V2 R2 How Can We Solve This One? R1 V1 V2 R3 R2 = V I1234 R12 THE ANSWER: Kirchhoff’s Rules 5 Kirchoff’s Voltage Rule ∑ ∆V i =0 Kirchoff's Voltage Rule states that the sum of the voltage changes caused by any elements (like wires, batteries, and resistors) around a circuit must be zero. If we model voltage as height above the ground floor, see...
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