RLC Circuits Flashcards
What is the symbol, circuit symbol and unit of an inductor?
Symbol: L
Circuit symbol: like the letter m
Unit: Henry, H
What is the symbol, circuit symbol and unit of a capacitor?
Symbol: C
Circuit symbol: Parallel lines
Unit: Farad, F
What is the equation to calculate the capacitance of a capacitor?
C = Q/v
C = Capacitance Q = Charge V = Voltage
What is the equation for the current through a capacitor?
i = ∆Q/∆t
When charging a capacitor, what is the equation for the charge on the capacitor with regards to current?
q = ∫ i(t) dt + q0 q = it + q0 [for constant current]
q = charge i = current t = time q0 = initial charge on the capacitor
When charging a capacitor, what is the equation for the voltage across the capacitor with regards to current?
v = 1/C × ∫ i(t) dt + v0 v = (1/C)it + v0 [for constant current]
v = voltage C = capacitance of the capacitor i = current t = time v0 = initial voltage
When charging a capacitor, what is the equation for the voltage across the capacitor with regards to the voltage applied as a factor of time and a time constant?
v = v0( 1 - e^(-t/τ) ) v = voltage v0 = applied voltage t = time τ = time constant
When charging a capacitor, what is the equation for the voltage across the capacitor with regards to the voltage applied as a factor of time and capacitance?
v = v0( 1 - e^(-t/RC) ) v = voltage v0 = applied voltage t = time R = Resistance of the resistor in the circuit C = Capacitance
When charging a capacitor, what is the equation for the power transferred to a capacitor in a circuit when there is a constant current?
p = (1/C) × i^2 × t
When charging a capacitor, what is the equation for the energy stored?
E = 0.5CV^2
When discharging a capacitor, what is the equation for the voltage across the capacitor with respect to a time constant?
v = v0e^(-t/τ)
v = voltage v0 = initial voltage t = time τ = time constant
When discharging a capacitor, what is the equation for the voltage across the capacitor with respect to a resistor in the circuit and the capacitance of the capacitor?
v = v0e^(-t/RC)
v = voltage v0 = initial voltage t = time R = Resistance of resistor in circuit C = Capacitance of capacitor
When discharging a capacitor, what is the equation to calculate the current through a capacitor?
i = i0e^(-t/RC)
i = current i0 = initial current t = time R = Resistance of resistor in circuit C = Capacitance of capacitor
When a capacitor is fully charged what is the current through the circuit?
i0 = v0/R
What is the equation for the voltage across an inductor?
v = L di/dt
v = voltage L = Inductance i = current t = time
What is the equation to combine capacitors in parallel?
Ct = C1 + C2 + C3 + … + CN
What is the equation to combine capacitors in series?
1/Ct = 1/C1 + 1/C2 + 1/C3 + … + 1/CN
What is the equations to describe the voltage and current from an AC power source?
v = Vsin(ωt) i = Isin(ωt)
v = voltage V = Max voltage ω = Angular frequency t = time i = current I = Max current
What is the equation that can relate voltage and current from an AC power source?
V = IR
e.g. i = (V/R)sin(ωt)
What is the equation for the power from an AC power source?
p = Vsin(ωt) × Isin(ωt) p = ((V^2)/R)(1-cos(2ωt))/2
p = power V = Max voltage ω = Angular frequency t = time I = Max current R = Resistance
What is an easy way to calculate RMS for sine waves?
r.m.s = peak/√2
How is Vrms calculated for non-sinusoidal waves?
Vrms = √[(1/T)∫(v^2)(t)dt]
T = Time period (which the RMS is calculated over) v = Voltage t = time
What is the equation for the voltage across an inductor connected to an AC power source?
v = Vsin(ωt)
v = voltage V = Vmax ω = Angular frequency t = Time
What is the equation for current through an inductor connected to an AC power supply
i = 1/L ∫ v(t) dt i = (-V/ωL)cos(ωt)
i = current V = Vmax L = inductance ω = Angular frequency t = time