Resistor capasitor and inductor Flashcards
(19 cards)
What is the function of resistors in DC circuits?
Resistors limit the current flow in the circuit.
What is the function of capacitors in DC circuits?
Capacitors store and release electrical energy.
What is the function of inductors in DC circuits?
Inductors store energy in a magnetic field when current flows through them.
What happens when the switch is open in a circuit with a capacitor?
The capacitor is completely discharged with V_R = 0V and V_C = 0V.
What happens when the switch is closed in a circuit with a capacitor?
The initial current is I = V/R, and the capacitor begins to charge.
What is the relationship between the potential difference across the capacitor and the resistor when the switch is closed?
Initially, V_C = 0V and V_R = V. As time progresses, V_C increases and V_R decreases.
What is Kirchhoff’s law in relation to this circuit?
V = V_R + V_C.
What is the time constant of a circuit symbolized by?
The time constant is symbolized by Ꞇ (tau).
How is the time constant Ꞇ calculated for a capacitor?
Ꞇ = C x R.
What percentage of change occurs in the circuit variables at t = 1Ꞇ?
The circuit variables have changed by 63.2%.
Fill in the blank: The approximate time it takes for a capacitor to fully charge is ____ seconds.
5Ꞇ.
What is the formula to calculate the time constant Ꞇ for an inductor?
Ꞇ = L/R.
What occurs when the switch is closed in a circuit with an inductor?
The initial current cannot rise instantly due to the self-induced emf in the inductor.
What is the maximum current limited by in a circuit with an inductor?
The maximum current is limited by the resistance R.
What happens to the potential difference across the inductor as time progresses after closing the switch?
Initially, V_L = V; as current increases, V_L approaches 0V.
What percentage change occurs in the circuit variables at t = 1Ꞇ for the inductor circuit?
63.2% change.
True or False: The time it takes for the current to reach its maximum value in an inductor circuit is independent of the circuit components.
False.
How long does it approximately take for the current to reach its maximum value in an inductor circuit?
Approximately 5Ꞇ seconds.
What is the initial current formula when the switch is closed in a circuit?
I = V/R.
