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Charge the Cap

Close the switch in an RC circuit. Predict the current, the charge or the time.

Physics · Class 12 · Charging through a resistor · 10 simulations. For JEE, NEET and your boards.

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What you'll learn

  1. The first instant: An empty capacitor acts like a wire
  2. One time constant: One time constant, 63%
  3. Let it empty: Emptying: q = q₀ e−t/RC
  4. Find C from the rise: One point on the curve fixes RC
  5. Heat in the resistor: Half the battery's work is heat
  6. Energy halves first: Energy falls twice as fast
  7. After a long time: At the end, the capacitor branch carries nothing
  8. Capacitor across a bridge: Find the two node voltages
  9. Key closed, then a moment later: The resistance the capacitor sees
  10. The leaky capacitor: A filling that leaks