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Q=cV
The discharge curve for a capacitor connected in series with a resistor is shown below, If...
A capacitor and a resistor that are in series are initially connected to a power supply with 22 volts. The power supply is then cut-off and the capacitor begins to discharge through the resistor. At t = 20 s, the voltage across the capacitor drops to 7 volts. What is the resistance of the resistor, in mega ohms (MΩ) if the capacitance, C = 7 μF ? Please give your answer in two decimal places.
A resistor and capacitor are connected in series to a power supply of 50 Volts. The resistor has a value of 30000 ohms and the Capacitor is initially uncharged. After a time of 16.0 seconds, the capacitor is charged 72% fully charged. a) What is the capacitance of capacitor in this circuit? b) What is the time constant of this system? c) What is the current through the resistor at t= 20.0 seconds? d) What is the potential difference across...
(a) A capacitor of capacitance 220 μF is connected in series with a 150 kΩ resistor, a switch and an ammeter. A d.c. power supply of negligible internal resistance is connected to the circuit as shown below 1 50 kΩ 220HF A stopclock is started and after 10 seconds the switch S is closed Ammeter readings are noted at regular intervals until a time of 80s is shown on the stopclock. The graph below shows how the current in the...
A capacitor is connected in series to a resistor with a resistance of 1.2ko and a battery with an emf of 12 V. a) What multiple of the time constant gives the time taken by the initially uncharged capacitor to reach 58% of its maximum charge? b) At that charge, what is the current through the resistor? At that charge, what is the potential across the capacitor? d) At that charge, what is the potential across the resistor?
10. A resistor and capacitor are connected in series to a voltage source. At time t = 0 the capacitor begins charging, and the charge on the capacitor is Qc. The graph below depicts Qc vs t. The slope of the graph represents: Qс CV a) The total charge on the capacitor b) The potential energy stored in the capacitor c) The equivalent resistance of the circuit d) The instantaneous voltage across the capacitor e) The instantaneous current through the...
(a) A capacitor has a value of 5 μF. Explain in terms of electric charge what this means. (b) The 5 uF capacitor shown in the circuit below is initially uncharged. The circuit is connected to a computer and switch S is closed. The monitor of the computer displays a graph of current against time as the capacitor charges monitoT charging current/uA 30 20 10 0 . 2,3 4 time s computer The battery has negligible internal resistance. (i) Calculate...
A fully discharged ideal capacitor is connected in series with a resistor and a battery. How long does it take to have equal potential difference across the resistor and across the capacitor? (time constant r = RC) Select one: a. T b. t/2 C 2T d 0.697
48. If a 5.6pF capacitor, a 49.3pF capacitor and a 35.5pF capacitor are all connected in series, then what is the total capacitance of this series combination in pico Farads? 50. If the Thevenin equivalent for a circuit is a 5V voltage source in series with a 5.3kΩ resistor, then what is the Norton equivalent current for this circuit in milliamps? 51. If the Norton equivalent for a circuit is a 2.2mA current source in parallel with a 23kΩ resistor,...
A fully discharged ideal capacitor is connected in series with a resistor and a battery. How long does it take to have equal potential difference across the resistor and across the capacitor? (time constant τ = RC) Select one: a. ττ b. 0.69τ0.69τ c. τ/2τ/2 d. 2τ
A 11.4 kΩ resistor and a capacitor are connected in series and then a 12.0 V potential difference is suddenly applied across them. The potential difference across the capacitor rises to 4.82 V in 1.48 µs. (a) Calculate the time constant of the circuit. (b) Find the capacitance of the capacitor. A 11.4 k2 resistor and a capacitor are connected in series and then a 12.0 V potential difference is suddenly applied across them. The potential difference across the capacitor...