The current is low after the capacitor is closed

What happens if there is no current in a capacitor?

The current thus decreases from its initial value of I0 = emf R I 0 = emf R to zero as the voltage on the capacitor reaches the same value as the emf. When there is no current, there is no IR IR drop, and so the voltage on the capacitor must then equal the emf of the voltage source.

What happens when a capacitor reaches a full voltage?

Over time, the capacitor’s terminal voltage rises to meet the applied voltage from the source, and the current through the capacitor decreases correspondingly. Once the capacitor has reached the full voltage of the source, it will stop drawing current from it, and behave essentially as an open-circuit.

What happens if a capacitor is a short circuit?

(A short circuit) As time continues and the charge accumulates, the capacitors voltage rises and it's current consumption drops until the capacitor voltage and the applied voltage are equal and no current flows into the capacitor (open circuit). This effect may not be immediately recognizable with smaller capacitors.

What happens if a capacitor reaches a steady state condition?

Energy will be dissipated in the resistor and eventually all energy initially stored in the capacitor, = C vc , will be dissipated as heat in the resistor. After a long time, the current will 2 be zero and the circuit will reach a new, albeit trivial, equilibrium or steady state condition (i=0, vc=0, vR=0).

How does capacitor repulsion affect current flow?

Current flows in the direction shown (opposite of electron flow) as soon as the switch is closed. Mutual repulsion of like charges in the capacitor progressively slows the flow as the capacitor is charged, stopping the current when the capacitor is fully charged and Q =C ⋅ emf Q = C ⋅ emf.

Why does a capacitor act like a short circuit at t 0?

Capacitor acts like short circuit at t=0, the reason that capacitor have leading current in it. The inductor acts like an open circuit initially so the voltage leads in the inductor as voltage appears instantly across open terminals of inductor at t=0 and hence leads.