10 nF The switch in the circuit shown in Figure 1 has been in position x for a long time. Att 0, the switch moves instantaneously to position y; 10 kN 75 V 20 kn $250 kM 40 nF 1- Determine v(t) of each capacitor and sketch it versus time. 2- Determine the dissipated and trapped energy.
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- You are working in an industrial plant. You have been instructed to double the capacitance connected to a machine. The markings on the capacitor, however, are not visible. The capacitor is connected to 560 volts and an ammeter indicates a current of 6 amperes flowing to the capacitor. What size capacitor should be connected in parallel with the existing capacitor? What is the minimum AC voltage rating of the new capacitor? What is the minimum DC voltage rating of the new capacitor? What is the minimum KVAR size that can be used in this installation?You find that a 25-F capacitor connected to 480 VAC is defective. The storeroom has no capacitors with a 480-VAC rating. However, you find two capacitors rated at 50 F and 370 VAC. Can these two capacitors be connected in such a manner that they can replace the defective capacitor? If yes, explain how they are connected and why the capacitors will not be damaged by the lower voltage rating. If no, explain why they cannot be used without damaging the capacitor.A pure capacitive circuit is connected to a 480-volt, 60-Hz power source. An ammeter indicates a current flow of 24 amperes. The circuit current must be reduced to 16 amperes by connecting a second capacitor in series with the first. What is the value of the existing capacitor? What value capacitor should be connected in series with the original capacitor to limit the circuit current to 16 amperes?
- What is the value of the induced voltage of the self-inductance when the rate of current is from 200 uA to 20 uA and the total time interval is 5 uS?C) A 25 A electrodynamic ammeter is controlled by a spring having a constant of 5.7295x 10-6 Nm/rad. The full scale deflection is 110°. Determine the inductance of the instrument while measuring a current of 20 A. The mutual inductance at 0° deflection is 4 u H and the change in mutual inductance is linear with the deflection.Based on Figure Q1(a), identify the equivalent inductance seen at the terminal of a and b. [4 marks] 30mH 30mH 30mH 40mH 25mH
- Find the current through the inductor shown in Figure lb. (i/p is AC, consider results upto one decimal place). 1. 100 V 100 Hz 500 L=60H Figure lbAn air filled parallel-plate capacitor is connected to a 12 Volts battery, the battery is disconnected when it is fully charged to 7.3 nC. The separation distance between the plates is d1= 8 cm. Now, If the plates are moved to a new distance d233 cm. the new energy stored in the capacitor is O a. 13.14 nJ O b. 8.21 nJ O c. 1.64 nJ O d. 10.96 nJ O e. 5.47 nJ O f. 16.42 nJEXAMPLE + 5V – 0.1uF At the instant the switch makes a contact with terminal a, the voltage across the capacitor is 5V. The 10V b 6V 100k2 switch remains at a for 9 ms then moves to terminal b. How many milliseconds after making contact with terminal a does the opamp 8V -6V saturate?
- 1. A purely resistive circuit the current is leading by 90° with respect to voltage. 2. A purely inductive circuit the current is lag behind the voltage by 90°. 3. A purely capacitive circuit the current is lead by 90° with respect to the voltage. 4. A capacitor element stored magnetic energy. 5. An inductor element stored electrical energy. 6. Resistor elements consume power. 7. Angle between current and voltage is called power. 8. The power factor angle for a purely resistive is zero. 9. The power factor angle for a purely inductive load is -90°. 10. The power factor of a purely capacitive is leading.An uncharged capacitor and bulb are connected in series with a battery. Describe and explain what happens to thebulb when the switch is closed. What determines when the capacitor stops charging? What happens if the capacitoris turned around after the switch has been closed a long time? Include where charge is flowing the circuit. Alsodescribe the different roles of the capacitor and the battery.Consider the circuit shown in Figure Q1(d), calculate the equivalent inductance, Leq at terminal a-b. 15 μΗ 36 μΗ 10 μΗ 25 μΗ 40 μΗ Figure Q1(d)