# V r2 r1 v calculation calculation

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Unformatted text preview: V3 D V2 < V3 V V2 = V3 = 2 BB 60 50 40 30 R1 = R2 = R3 = R Preflight 10 Compare the voltage across R1 with the voltage across R2 A V1 = V2 = V B V1 = ½ V2 = V C V1 = 2V2 = V D V1 = ½ V2 = 1/5 V E V1 = ½ V2 = ½ V 20 10 0 R1 in parallel with series combination of R2 and R3 V 1= V23 R2 = R3 ⇒ V2 = V3 V23 = V2 + V3 = 2V2 V1 = 2V2 = V R2 R1 V Calculation Calculation In the circuit shown: V = 18V, R1 = 1Ω, R3 R4 R2 = 2Ω, R3 = 3Ω, and R4 = 4Ω. What is V2, the voltage across R2? • Conceptual Analysis: – – Ohm’s Law: when current I flows through resistance R, the potential drop V is given by: V = IR. Resistances are combined in series and parallel combinations • Rseries = Ra + Rb • (1/Rparallel) = (1/Ra) + (1/Rb) • Strategic Analysis – – – Combine resistances to form equivalent resistances Evaluate voltages or currents from Ohm’s Law Expand circuit back using knowledge of voltages and currents R2 R1 V Calculation Calculation In the circuit shown: V = 18V, R1 = 1Ω, R3 R4 R2 = 2Ω, R3 = 3Ω, and R4 = 4Ω. BB What is V2, the voltage across R2? • Combine Resistances: R1 and R2 are connected: (A) in series (B) in parallel (C) neither in series nor in pa...
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