What is the Capacitance of the Unknown Capacitor in the Circuit?

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SUMMARY

The discussion focuses on calculating the capacitance of an unknown capacitor in a circuit with a series resistor of 11.6k ohms connected to a 180 V battery. After one second, the voltage across the capacitor is measured at 16.8 V. By applying Kirchhoff's Voltage Law and the formula for voltage across a charging capacitor, V_c(t) = V_o(1 - e^{-t/\tau}), where τ is the time constant (RC), the capacitance can be determined using the known voltage values.

PREREQUISITES
  • Understanding of Kirchhoff's Voltage Law
  • Familiarity with the charging equation for capacitors
  • Basic knowledge of exponential functions
  • Ability to manipulate equations involving resistance and capacitance
NEXT STEPS
  • Study the derivation of the charging equation for capacitors in RC circuits
  • Learn how to calculate time constants in RC circuits
  • Explore practical applications of capacitors in electronic circuits
  • Investigate the effects of different resistor values on capacitor charging times
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Homework Statement



a series combinations is 11.6k ohms resistor and an unknown capacitor is connected to the a 180 V battery. One second after the circuit is completed, the voltage across the capacitor is 16.8v. determine the capacitance of the capacitor?

Homework Equations



V=18
C?
1 sec later
V=16.8v

The Attempt at a Solution


c= q/v
i=v/r
 
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Derive the differential equation for the current/voltage across the capacitor when it's charging, using Kirchoff's Voltage Law, and solve.

Or if you're allowed to, just look up the solution of this equation, which should be in the form V_c (t) = V_o (1 - e^{-t/\tau}) where \tau is the time constant RC. You can then plug in your known values of V_c to solve for the capacitance.
 

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