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Explain the aim of the Dynamic Breaking Resistors used in VFD.

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HOW and/or then) 1. a) The circuit below has three resistors with values R₁-10 S2, R2-20 2, R3-30 S2, one initially (t=0) uncharged 0.001 F capacitor, and a 30 V battery. Find all the currents at t=0 (right after the switch is closed,) all the currents a long time after the switch is closed (at steady state), and the charge on the capacitor at t→∞0. At time t₁, once steady state with the switch close has been effectively reached, the switch is reopened. Find the currents at this time, right after reopening the switch. Make sure to make your reasoning clear! T=t₁ 4+ ww R₁ b JE S R₂ www www. R3 30 0.001 D₁ I₂ Iz 1+²0 12 O +=2
Item 10 Learning Goal: To understand the dynamics of a series R-C circuit. Consider a series circuit containing a resistor of resistance R and a capacitor of capacitance C connected to a source of EMF & with negligible internal resistance. The wires are also assumed to have zero resistance. Initially, the switch is open and the capacitor discharged. (Figure 1) Let us try to understand the processes that take place after the switch is closed. The charge of the capacitor, the current in the circuit, and, correspondingly, the voltages across the resistor and the capacitor will be changing. Note that at any moment in time during the life of our circuit, Kirchhoff's loop rule holds and, indeed, it is helpful: E - VR - Vc = 0, where VR is the voltage across the resistor and Vc is the voltage across the capacitor. Part A Immediately after the switch is closed, what is the voltage across the capacitor? O O O E ½/ε zero Submit Request Answer
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QUESTION 31 In a series circuit with a large power source supplying voltage to a light bulb, as well as a switch, but the bulb keeps burning out as the current flow is too high. Which of the following electrical devices could you add to the circuit to prevent the bulb from burning out and why? Another battery as this will increase the voltage and thereflow increase the current flow. A resistor, because this will increase the circuit's resistance & decrease current flow. A smaller light as this will increase the voltage and therefore the current flow. A fuse as this will drop the current flow to zero.
Calculate the time constant of the RC-circuit depicted here