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SC PHYS 202 - RL and RC circuits

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Phys 202 1nd Edition Lecture 18Outline of Last Lecture I. EMF and inductanceOutline of Current Lecture II. RL CircuitIII. RC CircuitIV. Example True/FalseCurrent LectureRL and RC circuit:An RL circuit refers to a circuit comprised of resistors and inductors. An RC circuit refers to the circuit comprised of resistors and capacitors. The way that current flows through these circuits depends on whether a circuit contains a capacitor or an inductor, as well as how long the current has been moving through the circuit. Picture the following RL Circuit: R L V S1In this circuit, R represents the resistor, L represents the inductor, V is the battery or voltage source, and S1 is an open switch. Immediately after the switch is closed(t=0), the current through the inductor will be equal to 0 and the potential difference (V) through the inductor will be equal to –E of the circuit. After the switch has been closed for a long time (t=∞), the current through the inductor will equal to E/R and the potential difference through the inductor will be equal to zero.Remember that an inductor will, at least for an instant, conserve whatever current is running through it. When the switch is open, there is obviously no current flowing through it (i=0), which is why the instant the switch is closed, the current through the inductor is conserved at 0. Eventually, however, the current evens out and flows normally through the inductor. So what happens if the switch is closed for a long These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.time and is then opened again? The current is conserved, so the instant the switch is open, the current isstill equal to E/R and the potential difference is equal to 0.We can contrast this to an RC circuit: R C V S1In this circuit, R represents the resistor, C represents the capacitor, V is the battery or voltage source, andS1 is an open switch. Immediately after the switch is closed(t=0), the current through the capacitor will be equal to E/R and the potential difference (V) through the capacitor will be equal to 0. After the switch has been closed for a long time (t=∞), the current through the capacitor will equal to 0 and the potentialdifference through the capacitor will be equal to E of the circuit.Example problem:Answer True/false for the following statements, based on the circuit bellow: L V C S1 RA) Immediately after the swich is closed(t=0), the potential difference of the capacitor is equal to V (Vc=V) Answer: False: Immediately after the switch is closed, the potential difference through the capacitor will be 0B) Immediately after the switch is closed(t=0), the potential difference through the inductor will be equal to V (VL=V)Answer: TrueC) A long time after the swich is closed, the potential difference of the capacitor is equal to V (Vc=V)Answer: TrueD) A long time after the switch is closed(t=∞) the current through the capacitor is equal to 0Answer:


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SC PHYS 202 - RL and RC circuits

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