R R' C= Gas-filled tube (a) If the illustration above, has the charged Capacitor , C=35µF is connected to a resistance, R= 1200, how much time will elapse until the voltage falls to 1Opercent of its original(maximum) value?
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- in the curcuit shown in the figure , the S switch is closed at t = 0 and the capacitors, which are completely empty, begin to fill. Here E = 20 V , C = 4uF and R = 30 ohm. a) what is the time constant of the circuit , T in units of microseconds? b)when t=T , what is the total charge , in units of microcloumb accumulated in the capacitors ?A pacemaker sends a pulse to a patient’sheart every time the capacitor in the pacemaker charges to a voltageof 0.25 V. It is desired that the patient receive 75 pulses per minute.Given that the capacitance of the pacemaker is 110 mF and that thebattery has a voltage of 9.0 V, what value should the resistance have?A capacitor, in series with a resistor, is being charged. At the end of 12 ms its charge is 60% of the final value. What is the time constant?
- The capacitance in the curcuit is C = 0.3μF, the total resistance is R=20kQ and the battery emf is 12 V. Determine the time is takes for the charge the capacitor could acquire, to reach 99% of max value.Equation P = I2R Seems to suggest that rate of increase of internal energy in a resistor is reduced, if the resistance is made less. Equation P = V2/R seams to suggest just the opposite. How do you reconcile this apparent paradox?Integrated Concepts. A 12.0-V emf automobile battery has a terminal voltage of 16.0 V when being charged by a current of 10.0 A. At what rate (in oC/min ) will its temperature increase if its mass is20.0 kg and it has a specific heat of 0.300 kcal/kg. oC, assuming no heat escapes?
- An electrical circuit contains a capacitor of Z picofarads and a resistor of X ohms. If the capacitor is fully charged, and then the voltage is interrupted, in how much time will about 95% of its charge be transferred to the resistor? Show your calculations.Obtain an expression for current S, whena capacitor is charged through a resistance A, for a constant EMF I. How do yourepresent this expression graphically?In the circuit shown in the figure, the S switch closed at t=0 and the capacitors, which are completely empty, begin to fill. Here ε=10 V, C=5 μF and R=55 Ω. What is the time constant of the circuit, τ, in units of microseconds? When t= τ, what is the total charge, in units of microcoulomb, accumulated in the capacitors?
- A capacitor used to provide steady voltages in the power supply of a stereo amplifier charges rapidly to 35 V every 1/60 second. It must then hold that voltage to within 1.0 V for the next 1/60 s while it discharges through the amplifier. If the amplifier draws 1.2 A from the 35-V supply, (a) what’s its effective resistance, and (b) what capacitance is needed?You have a capacitor that's discharging through a resistor toward zero voltage. What fraction of the inital voltage will the capacitor have after time 2RC?An electronic apparatus may have large capacitors at high voltage in the power supply section, presenting a shock hazard even when the apparatus is switched off. A “bleeder resistor” is therefore placed across such a capacitor, as shown schematically , to bleed the charge from it after the apparatus is off. Why must the bleeder resistance be much greater than the effective resistance of the rest of the circuit? How does this affect the time constant for discharging the capacitor?