All Flashcards
What is the effect of increasing the resistance in an RC circuit on the time constant?
It increases the time constant, slowing down the charging/discharging process.
What is the effect of increasing the capacitance in an RC circuit on the time constant?
It increases the time constant, slowing down the charging/discharging process.
What happens to the current in an RC circuit as a capacitor charges?
The current decreases over time, approaching zero when the capacitor is fully charged.
What happens when a charged capacitor is discharged through a resistor?
The stored energy in the capacitor is dissipated as heat in the resistor, and the capacitor's voltage decreases.
What happens when an uncharged capacitor is connected to a voltage source through a resistor?
Charge begins to flow, accumulating on the capacitor plates, and a current flows through the resistor.
What happens during the charging process of a capacitor in an RC circuit?
Initially, the capacitor acts like a wire, allowing charge flow. As it charges, its potential difference increases, current decreases, and energy is stored until fully charged with zero current.
What happens during the discharging process of a capacitor in an RC circuit?
The capacitor releases stored charge through the resistor. Potential difference, current, and stored energy decrease over time until reaching steady state.
How do you find the equivalent capacitance of capacitors in series?
Sum the inverses of individual capacitances: .
How do you find the equivalent capacitance of capacitors in parallel?
Simply add the individual capacitances: .
How do you calculate the time constant in an RC circuit?
Multiply the equivalent resistance and equivalent capacitance: .
What are the steps to find the equivalent capacitance of capacitors in series?
- Identify all capacitors in series. 2. Calculate the inverse of each capacitance. 3. Sum the inverses. 4. Take the inverse of the sum to find : .
What are the steps to find the equivalent capacitance of capacitors in parallel?
- Identify all capacitors in parallel. 2. Sum the individual capacitances to find : .
Describe the process of charging a capacitor in an RC circuit.
- Initially, the uncharged capacitor acts like a wire. 2. Charge flows, increasing the capacitor's potential difference and stored energy. 3. The rate of charging decreases over time. 4. After a long time, the capacitor is fully charged, and the current becomes zero.
Describe the process of discharging a capacitor in an RC circuit.
- Initially, the capacitor is charged. 2. Charge flows out of the capacitor through the resistor, decreasing its potential difference and stored energy. 3. The rate of discharging decreases over time. 4. After a long time, the capacitor is fully discharged, with zero charge and energy.
How do you calculate the time constant (τ) in an RC circuit?
Multiply the equivalent resistance () by the equivalent capacitance (): .
