Help With 15.15 & 15.16: A Capacitor + Resistor Circuit

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Homework Help Overview

The discussion revolves around a circuit problem involving a capacitor and resistor in series, with specific questions about voltage, current, and charge at different stages of the circuit's operation. The subject area includes concepts from electrical circuits and capacitor behavior.

Discussion Character

  • Exploratory, Conceptual clarification, Problem interpretation

Approaches and Questions Raised

  • Participants are attempting to understand the relationships between voltage, current, and resistance in the circuit. Questions about the initial conditions when the switch is closed and the steady-state conditions are raised. There is also inquiry into the calculations performed and the underlying principles governing capacitor behavior.

Discussion Status

Some participants are seeking clarification on their initial thoughts and calculations, while others emphasize the need for more information about the original poster's reasoning and work. There is an ongoing exploration of the relationships and functions of the components involved in the circuit.

Contextual Notes

The original poster has not provided their calculations or reasoning, which is noted as a barrier to further assistance. The discussion is constrained by the need for more detailed input from the original poster to facilitate meaningful guidance.

CathyLou
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Hi.

I've no idea how to answer the following questions. Could someone please help? I'd really appreciate it.

15.15 A capacitor is joined in series with a resistor, a low resistance microammeter, a switch and a 12 V battery.

(a) When the switch is first closed, what is

(i) the p.d. across the capacitor

(ii) the p.d. across the resistor

(iii) the current

(iv) the charge on each of the capacitor plates?

(b) Calculate also the same quantities when the switch has been closed for some time so that steady conditions have been reached.

(c) If the capacitor had continued to charge at its initial rate, how long would it have taken to become fully charged?

15.16 In the previous question, at a certain instant after the switch has been closed the microammeter reads 9.5 μA. Calculate, for this instant

(a) the p.d. across the resistor

(b) the p.d. across the capacitor

(c) the charge on each of the capacitor plates?

Thank you.

Cathy
 
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well no one will help you unless you give us your work and thougts so far.
 
For (a) (i) I wrote down 12 V, but I'm not sure if this is correct or how to do the next parts.
 
how did you perform your calculations? What relationsships are there bewteen resistance, current and voltage ? What is the function of a capacitor? What is the capacitors capacitance?
 

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