Current in Circuit with Emf, Resistor & Capacitor

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Homework Help Overview

The discussion revolves around a circuit containing an electromotive force (emf) of -5V, a 5-ohm resistor, and a 20 F capacitor. Participants are exploring the impact of the capacitor on the current in the circuit.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants are considering how the configuration of the circuit (series or parallel) and the nature of the emf (constant or varying) influence the current. There are questions about the effects of the capacitor on current flow over time.

Discussion Status

Some participants have provided insights into the behavior of capacitors in DC and AC circuits, noting that a capacitor will block DC current after a certain period. Others have pointed out that the effects may vary depending on the circuit configuration and the type of emf applied.

Contextual Notes

There is a lack of clarity regarding the specific configuration of the circuit (series or parallel) and whether the emf is constant or varying, which may influence the discussion further.

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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