Transcription of Chapter 21: RLC Circuits
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Chapter 21: RLC Circuits
PHY2054: Chapter 211 Chapter 21: RLC CircuitsPHY2054: Chapter 212 Voltage and Current in RLC Circuits AC emf source: driving frequency f If circuit contains only R + emf source, current is simple If L and/or C present, current is notin phase with emf Z, shown later()sinmmmiItIZ = =sinmt =2f =()()sincurrent amplitudemmmiI tIRR ===PHY2054: Chapter 213AC Source and Resistor Only Driving voltage is Relation of current and voltage Current is in phasewith voltage ( = 0)i R~sinmmmiIt IR ==sinmt =/iR =PHY2054: Chapter 214AC Source and Capacitor Only Voltage is Differentiate to find current Rewrite using phase (check this!)
PHY2054: Chapter 21 29 Transformers: Sample Problem ÎA transformer has 330 primary turns and 1240 secondary turns. The input voltage is 120 V and the output current is 15.0 A. What is the output voltage and input current? 1240 120 451V 330 s sp p N VV N ⎛⎞ == =⎜⎟ ⎝⎠ “Step-up” transformer iV iV pp ss= 451 15 56.4A 120 s ps p V ...
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