Find the Maximum Charge of a Capacitor

AI Thread Summary
To find the maximum charge of a capacitor in the given circuit, use the formula Q = CV, where C is the capacitance and V is the voltage. With a capacitance of 330 µF and a voltage of 4V, the maximum charge can be calculated as Q = 330 µF * 4V. The time to half charge and resistance values provided are not necessary for this calculation. The voltage vs. time graph can help confirm the results, but the direct relationship between charge and voltage is key.
jvdamdshdt
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Homework Statement


Hey guys, I am having problems with finding the maximum charge of a capacitor.
From the experiment we are given R=100 Ohms, and Capacitance = 330 uF
We are asked to find the maximum charge the capacitor has.
Time to half charge was 0.0235 sec.

Voltage is 4V

Homework Equations


Q=Qmax[1−e(−t/RC)]

The Attempt at a Solution


I've tried setting Qmax to one and Q to zero to represent a 100 percent but I can't get an answer. I am thinking you can never meet an actual max of a capacitor but I may be wrong.
 
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It's likely you weren't measuring the charge (Coulombs) directly. What instrument were you taking measurements with?
 
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gneill said:
It's likely you weren't measuring the charge (Coulombs) directly. What instrument were you taking measurements with?

We were given a circuit with a resistor and capacitor. The circuit was then connected to an a ground on one side and a output voltage of 4V. We are asked to find the maximum charge of the experiment. I am thinking I am supposed to calculate the maximum charge using what is given.
 
jvdamdshdt said:
We were given a circuit with a resistor and capacitor. The circuit was then connected to an a ground on one side and a output voltage of 4V. We are asked to find the maximum charge of the experiment. I am thinking I am supposed to calculate the maximum charge using what is given.

So you were taking voltage measurements? How is charge related to voltage on a capacitor?
 
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gneill said:
So you were taking voltage measurements? How is charge related to voltage on a capacitor?

We had a voltage vs time graph at the end.
I am thinking this is the formula to find the charge? Q=CV
 
jvdamdshdt said:
We had a voltage vs time graph at the end.
I am thinking this is the formula to find the charge? Q=CV

That would be the one! You should be able to find your max Q from your max V since C is a constant.
 
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gneill said:
That would be the one! You should be able to find your max Q from your max V since C is a constant.

Thanks a lot. Sometimes I don't think.
 
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