Current in Circuit with Emf, Resistor & Capacitor

AI Thread Summary
In a circuit with a -5V emf, a 5-ohm resistor, and a 20 F capacitor, the current is influenced by the capacitor's behavior. Initially, when a steady emf is applied, the capacitor affects the current, but after some time, it either stops current flow or has no effect. If the emf is alternating current (AC), the situation becomes more complex, as the capacitor will block direct current (DC) after a certain period. The configuration of the circuit (series or parallel) also plays a crucial role in determining how the capacitor interacts with the current. Understanding these dynamics is essential for analyzing circuit behavior effectively.
swechan02
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If there is a circuit with--Emf -5V and one 5ohm resistor and one 20 F capacitor, what is the current of the circuit?
Will there be any effects on current because of capacitor? :smile:
 
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swechan02 said:
If there is a circuit with--Emf -5V and one 5ohm resistor and one 20 F capacitor, what is the current of the circuit?
Will there be any effects on current because of capacitor? :smile:

It depends on whether the emf is constant and how the resistor and capacitor are connect to the source. In all cases I can think of, the capacitor affects the current when a steady emf is first applied. After some time, it either has no effect, or it keeps current from flowing. If the emf is varying in time, it's a whole different problem.
 
futb0l said:
The capacitor will block the DC Current after a certain amount of time. If the supply is AC then it will be more complicated.

It will block the current through the capacitor, but not the current through the emf source and the resistor unless it is a series circuit. That has not been specified.
 

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