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Teptip
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Thanks, solved!
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Teptip said:Here is the circuit in question: http://imgur.com/glr2C4f
Homework Statement
Find the charge on the 4 µF capacitor if
R1 = 11 Ω and R2 = 4 Ω .
Answer in units of µC
Homework Equations
V = IR
C = Q/V
The Attempt at a Solution
We've never had to deal with capacitors in parallel with resistors before so I'm not sure how this works.
Do I assume the total resistance of the circuit is in series and thus = 16Ω ?
Teptip said:What voltage do I use for the C=Q/V equation?
Teptip said:Okay so I can calculate current I=V/R = 19/16 = 1.1875 A
No, what do you mean of Vtotal? And you do not need it.Teptip said:V total = (V of Capacitor) + (V of 11Ω Resistor)
You know the voltage across the 11 Ω resistor. Look at the figure. Where are the plates of the capacitor connected to?Teptip said:V of 11Ω Resistor = IR = (1.1875)(11) = 13.0625
Teptip said:Is the voltage I want then just the voltage across the 4Ω resistor?
Teptip said:Ah is it the same current as throughout, since the capacitor is quickly charged?
(I = 1.1875 A so V = (1.1875)(4) and then this voltage is the same that would go through the capacitor?)
The charge on a capacitor in an RC circuit can be calculated using the formula Q = CV, where Q is the charge, C is the capacitance of the capacitor, and V is the voltage across the capacitor.
The time constant in an RC circuit is a measure of how quickly the capacitor charges or discharges. It is equal to the product of the resistance and capacitance in the circuit and determines the rate at which the capacitor reaches its maximum charge or discharges to zero.
The charge on a capacitor in an RC circuit follows an exponential curve, where it starts at zero and increases as the capacitor charges. As the capacitor reaches its maximum charge, the rate of increase slows down until it reaches a steady state.
No, the charge on a capacitor in an RC circuit cannot be negative. The capacitor can only hold a positive charge, and any attempt to charge it with a negative voltage will result in the capacitor discharging.
The charge on a capacitor in an RC circuit is affected by the capacitance of the capacitor, the voltage across the capacitor, and the resistance in the circuit. A higher capacitance or voltage will result in a larger charge, while a higher resistance will slow down the charging process.