Is time constant, for capacitors, changed by series/parallel connection?

In summary, to determine whether the two 2000uF capacitors in the enclosed box are joined in series or in parallel, one could use the equations C = C1 + C2 in parallel and 1/C = 1/C1 + 1/C2 in series to calculate the total capacitance. If the total capacitance is 4000uF, then the capacitors are joined in parallel, and if it is 1000uF, then they are joined in series. However, in order to actually determine the way the capacitors are connected, one would need to use a circuit and measure the time constant, taking into account the effects of the capacitors being connected in series or parallel.
  • #1
ZedCar
354
1

Homework Statement


If you were given an enclosed box, containing two 2000uF capacitors, which were either joined in series or in parallel, suggest, with a reason, how you would determine which way they were connected.



Homework Equations


C = C1 + C2 in parallel

1/C = 1/C1 + 1/C2 in series


The Attempt at a Solution


I have calculated (using above equations) that in series the total capacitance is 1000uF, and in parallel the total capacitance is is 4000uF.

Therefore in series the total capacitance is double one of the capacitors and in parallel the total capacitance is half one of the capacitors. So this is how I have answered the question.

Though I'm wondering if I should mention about the time constant and how it is affected for both series and parallel?

Thanks very much
 
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  • #2
Your calculations are correct, but they alone don't answer the question of how you would determine the way the two are connected. You need to explain how you'd figure out what's inside: what kind of circuit you'd use, what you'd measure, etc. Your time constant idea is a good place to start.
 

1. How does connecting capacitors in series affect the time constant?

Connecting capacitors in series increases the overall time constant. This is because the series connection decreases the total capacitance, which in turn increases the time constant according to the formula τ = RC.

2. Does connecting capacitors in parallel change the time constant?

Connecting capacitors in parallel does not change the time constant. This is because the total capacitance increases in a parallel connection, but the resistance remains the same, resulting in the same time constant as a single capacitor.

3. Can the time constant be changed by using different values of capacitors in a series/parallel connection?

Yes, using different values of capacitors in a series/parallel connection can change the time constant. The time constant is directly proportional to the product of resistance and capacitance, so changing either of these values will alter the time constant.

4. How does the time constant affect the charging and discharging of a capacitor?

The time constant determines the rate at which a capacitor charges and discharges. A larger time constant results in a slower charging and discharging process, while a smaller time constant leads to a faster process.

5. Does the time constant change if capacitors are connected in a mixed series/parallel configuration?

Yes, the time constant can change in a mixed series/parallel configuration. The total capacitance and resistance will be different in this type of connection, resulting in a different time constant compared to a purely series or parallel connection.

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