A coil having a resistance of 8 Q and inductance of 2 H is switched across a 48 V DC supply. The time constant of the circuit and the final value of the current in the circuit are:
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- An RC series circuit is connected to a 120-V, 60-Hz power source. The resistor is 25 and has a voltage drop of 65 volts. What is the capacitance of the capacitor?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?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.
- 3. A resistor and a capacitor are connected in parallel across a 120 V DC source. Determine the voltages across the resistor and the capacitor.The figure below shows the lengthwise cross-section of a current-carrying coil. The coil carries a current of I, and there are N evenly space turns along the length l of the coil. The figure shows a portion of this coil. A DWith V1, voltage peak to peak is 10 volts, R1=200 Ohm, R2=1000 Ohm and C1= 300 nF. Find Vx, voltage across the the capacitor, C1 and R2 when the frequency is 1000 Hz and 10000 Hz
- What is the equivalent resistance ?? and what is the total inductance ??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.QUICK A 100 µF capacitor in series w/ a 50-ohm resistance is connected suddenly across a 125-volt DC supply. What is the voltage in the capacitor after 10 ms? 79 V 100 V 108 V 125 V
- a.) What is the resistance in the circuit a long time after the switch is closed? b.) What is the current through both resistors a long time after the switch is closed? c.) What is the current through the inductor a long time after the switch is closed?Circuits InductanceAn inductive coil takes a current of 2A and consumes 160 W when connected to a 240 V AC supply. A second coil when connected across the same supply takes 3 A and 500 W. Find the total power when the two coils are connected in series to this supply.