When RLC series circuit resonates, because the impedance is the smallest, equal to the resistance R, so the quality factor Q of the circuit is the largest?

When RLC series circuit resonates, because the impedance is the smallest, equal to the resistance R, so the quality factor Q of the circuit is the largest?

The quality factor of a circuit is an electrical index of the circuit, which is determined by the component parameters (R, l, c) of the circuit, and has nothing to do with whether the circuit works in the resonant state

1. Impedance Z is called (). A, input impedance B, reactance C, inductive reactance D, equivalent impedance 2, RLC series circuit resonance is characterized by ()
1. The impedance Z is called () of the circuit
A. Input impedance
B. Reactance
C. Inductive reactance
D. Equivalent impedance
2. The characteristic of RLC series circuit resonance is ()
A. Inductive reactance is equal to capacitive reactance
B. It is called voltage resonance
C. It is called current resonance
D. The impedance of the circuit is resistive
3. When RLC series circuit appears (), it is called series resonance
A. The port voltage and current are in phase
B. The port voltage leads the current by an angle
C. Port voltage lags current by one angle
D. The equivalent impedance is a pure resistance
4. The common point of series resonance and parallel resonance is ()
A. The port voltage and current are in phase at resonance
B. The port voltage is one angle ahead of the current at resonance
C. The reactive power of the circuit is zero
D. The whole circuit is equivalent to a resistor
5. If the voltage on Z1 is 3V and that on Z2 is 4V, the total voltage after series connection may be ()
A、7V
B、5V
C、1V
D、25V
Note that this is a multiple choice question

1,B
2,D
3,A
4,D
5, a or C, add in the same direction, and subtract absolute value in reverse series

Looking for ancient poems and words about wine
There are 12 ancient poems about wine and 12 words about wine. I want to help me separate the words from the ancient poems and indicate which is the poem and which is the word

Li Baijun will not see the water of the Yellow River in the sky, but will not return to the sea. You will not see the bright mirror in the high hall, sad and white hair, like green silk in the morning, and snow in the evening. You must be happy in your life, and do not let the golden cup empty to the moon

(m2-4m) M2 + 8 (m2-4m) + 16 =

The fourth power of (m-2)

One half divided by (eight minus three quarters, x) = one quarter
Scores should be answered in the form of words~

1 / 2 / (8-3 / 4 x) = 1 / 4
Half / quarter 32-3x = quarter
32-3x=8
x=8

Given the moving circle and the fixed circle C: x ^ 2 + y ^ 2 + 4y-32 = 0 and passing through the fixed point a (0,2), the trajectory equation of the center of the moving circle is given

Point C (0, - 2), according to the known conditions, the locus of the center of the moving circle is an ellipse,
So let the trajectory equation be y ^ 2 / A ^ 2 + x ^ 2 / b ^ 2 = 1 (focus on the Y axis)
When the center of the circle moves to the y-axis, the coordinates of the two centers are (0,3) (0, - 3) respectively
Substituting a ^ 2 = 9
We know a focus a (0,2), so C ^ 2 = 4,
Because C ^ 2 = a ^ 2-B ^ 2
So B ^ 2 = 5
The trajectory equation is y ^ 2 / 9 + x ^ 2 / 5 = 1

Solving equation: X divided by 5 + bracket (42-x) divided by 3 bracket = 10
It's better to explain the meaning of each film

Multiply both sides by 15
3x+5(42-x)=150
3x+210-5x=150
5x-3x=210-150
2x=60
x=60÷2
x=30

How to calculate 99 * 72 + 78

99*72+78
=（99+1）*72+（78-72）
=7200+6
=7206

What is the result of 199 and 198 / 199 times - 5

198 × (- 5) of 199 and 199
=(1 / 200-199) × (- 5)
= 200 × (- 5) - [1 / 199 × (- 5)]
= - 1000 + (5 / 199)
= - 999 and 194 / 199

Factorization: 1, x ^ 3-xy ^ 2 2, ax ^ 2-A 3, 2x ^ 2-8 4, 2A ^ 3-8a

x^3-xy^2
=x(x^2-y^2)
=x(x+y)(x-y)
ax^2-a
=a(x^2-1)
=a(x-1)(x+1)
2x^2-8
=2(x^2-4)
=2(x+2)(x-2)
2a^3-8a
=2a(a^2-4)
=2a(a-2)(a+2)