RC Circuits

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What is a Capacitor and what is Capacitance

See Capacitors

RC Circuits

Capacitor Charging (Voltage over Time)

Charging.png

During charging, the voltage across a capacitor increases exponentially, approaching its final value.

  • Where:*
  • *V(t)* is the voltage at time t (in volts, V)
  • *V_0* is the final voltage (in volts, V)
  • *R* is the resistance (in ohms, Ω)
  • *C* is the capacitance (in farads, F)
  • *t* is time (in seconds, s)


Capacitor Discharge (Voltage over Time)

Discharging.png

During the discharge of a capacitor through a resistor, the voltage decreases exponentially over time.

  • Where:*
  • *V(t)* is the voltage at time t (in volts, V)
  • *V_0* is the initial voltage (in volts, V)
  • *R* is the resistance (in ohms, Ω)
  • *C* is the capacitance (in farads, F)
  • *t* is time (in seconds, s)

Example Graphs

RC example graph.png


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