RLC Circuits Flashcards

1
Q

What is the symbol, circuit symbol and unit of an inductor?

A

Symbol: L
Circuit symbol: like the letter m
Unit: Henry, H

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2
Q

What is the symbol, circuit symbol and unit of a capacitor?

A

Symbol: C
Circuit symbol: Parallel lines
Unit: Farad, F

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3
Q

What is the equation to calculate the capacitance of a capacitor?

A

C = Q/v

C = Capacitance
Q = Charge
V = Voltage
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4
Q

What is the equation for the current through a capacitor?

A

i = ∆Q/∆t

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5
Q

When charging a capacitor, what is the equation for the charge on the capacitor with regards to current?

A
q = ∫ i(t) dt + q0
q = it + q0 [for constant current]
q = charge
i = current
t = time
q0 = initial charge on the capacitor
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6
Q

When charging a capacitor, what is the equation for the voltage across the capacitor with regards to current?

A
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
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7
Q

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?

A
v = v0( 1 - e^(-t/τ) )
v = voltage
v0 = applied voltage
t = time
τ = time constant
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8
Q

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?

A
v = v0( 1 - e^(-t/RC) )
v = voltage
v0 = applied voltage
t = time
R = Resistance of the resistor in the circuit
C = Capacitance
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9
Q

When charging a capacitor, what is the equation for the power transferred to a capacitor in a circuit when there is a constant current?

A

p = (1/C) × i^2 × t

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10
Q

When charging a capacitor, what is the equation for the energy stored?

A

E = 0.5CV^2

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11
Q

When discharging a capacitor, what is the equation for the voltage across the capacitor with respect to a time constant?

A

v = v0e^(-t/τ)

v = voltage
v0 = initial voltage
t = time
τ = time constant
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12
Q

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?

A

v = v0e^(-t/RC)

v = voltage
v0 = initial voltage
t = time
R = Resistance of resistor in circuit
C = Capacitance of capacitor
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13
Q

When discharging a capacitor, what is the equation to calculate the current through a capacitor?

A

i = i0e^(-t/RC)

i = current
i0 = initial current
t = time
R = Resistance of resistor in circuit
C = Capacitance of capacitor
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14
Q

When a capacitor is fully charged what is the current through the circuit?

A

i0 = v0/R

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15
Q

What is the equation for the voltage across an inductor?

A

v = L di/dt

v = voltage
L = Inductance
i = current
t = time
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16
Q

What is the equation to combine capacitors in parallel?

A

Ct = C1 + C2 + C3 + … + CN

17
Q

What is the equation to combine capacitors in series?

A

1/Ct = 1/C1 + 1/C2 + 1/C3 + … + 1/CN

18
Q

What is the equations to describe the voltage and current from an AC power source?

A
v = Vsin(ωt)
i = Isin(ωt)
v = voltage
V = Max voltage
ω = Angular frequency
t = time
i = current
I = Max current
19
Q

What is the equation that can relate voltage and current from an AC power source?

A

V = IR

e.g. i = (V/R)sin(ωt)

20
Q

What is the equation for the power from an AC power source?

A
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
21
Q

What is an easy way to calculate RMS for sine waves?

A

r.m.s = peak/√2

22
Q

How is Vrms calculated for non-sinusoidal waves?

A

Vrms = √[(1/T)∫(v^2)(t)dt]

T = Time period (which the RMS is calculated over)
v = Voltage
t = time
23
Q

What is the equation for the voltage across an inductor connected to an AC power source?

A

v = Vsin(ωt)

v = voltage
V = Vmax
ω = Angular frequency
t = Time
24
Q

What is the equation for current through an inductor connected to an AC power supply

A
i = 1/L ∫ v(t) dt
i = (-V/ωL)cos(ωt)
i = current
V = Vmax
L = inductance
ω = Angular frequency
t = time
25
What is the equation for sinusoidal voltage for complex ac circuits?
``` v(t) = V(cos(ωt) + jsin(ωt)) v(t) = Ve^jωt ```
26
What is the equation to calculate the voltage across a single capacitor for multiple capacitors joined in series?
Vx = Vt × Ct/Cx Where Vx is the voltage across the targeted capacitor (Cx) Where Vt is the total voltage across all the capacitors (Ct)
27
What is the equation for calculating the thevenin resistance?
Rth = Voc / Isc
28
What is norton resistance?
This is the value of the resistor in the norton equivalent circuit. It is equal to the thevenin resistance
29
How is a norton equivalent circuit converted to a thevenin equivalent circuit?
``` Rth = Rn Vth = InRn = InRth ```
30
How is a thevenin equivalent circuit converted to a norton equivalent circuit?
``` Rn = Rth In = Vth / Rth ```
31
What is the equation for calculating the current through two parallel capacitors?
I2 = I × R1/(R1+R2)