summary7 - Summary Lecture 7 Ohm’s Law V = ItotRtot...

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Unformatted text preview: Summary Lecture 7 Ohm’s Law V = ItotRtot Series Circuits Circuits current is the same through all elements Itot = I1 = I2 V = V1 + V2 R = R 1 + R2 V1 = Itot R1 = R1/Rtot V V2 = Itot R2 = R2/Rtot V R1 V R2 Parallel Circuits Circuits same voltage across all elements elements V = V1 = V2 Itot = I1 + I2 1/R = 1/R1 + 1/R2 I1 = V / R1 I2 = V / R2 V R1 R2 Electric Power and Energy Electric potential Energy: PE = Q V Using the definition of current I = Q/t the definition of current Q/t (Electric) Energy = VIt Power = Energy transformed time PE = V Q P= t t =VI P = VI = RI2 = V2/R VI RI Power lost in a wire: PLost = RI2 lost in wire: RI Energy = Power x Time = VIt [kWh] 4-Resistor Circuit V = 10.0 V R1 = 100 R3 = 60 R2 = 30 R4 = 25 R1 R4 V R2 Questions: • What is I1, the current through R1? • What is Rtot (Rs) • What is V2 and I2? R3 ...
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summary7 - Summary Lecture 7 Ohm’s Law V = ItotRtot...

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