Kirchhoff's law only applies to true current circuits, but not to AC circuits, right?

Kirchhoff's law is a universal law in circuit theory, which is applicable to both DC and AC circuits

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1. Kirchhoff's law and Ohm's law can be applied to any circuit, right? If something is wrong!
2. When Kirchhoff's law is used, how many branches are there and how many nodes are there
3. What is the reason for the error in the verification experiment of Kirchhoff's voltage and current law?
4. Understanding of Kirchhoff's law most urgent!
5. Kirchhoff's law experiment 1. According to the circuit parameters in Figure 2-1, calculate the current I1, I2, I3 to be measured and the voltage value on each resistance, and record them in the table In order to select the range of milliammeter and voltmeter correctly 2. In the experiment, if the current of each branch is measured by the direct current milliampere range of the pointer multimeter, under what circumstances may the pointer appear How to deal with reverse bias? What should be paid attention to when recording data? If DC digital milliammeter is used for measurement, there will be some problems What is the display? 3. In the experiment of superposition principle, how to make U1 and U2 act separately? Can the non acting one be directly controlled The power supply (U1 or U2) is short circuited to zero?
6. Explain why the power factor of induction motor always lags with vector diagram of induction motor? Why is induction motor not suitable for light load operation?
7. Sinusoidal AC voltage U = 220 root 2Sin (1000t + π / 3) V, which is applied to both ends of a 10 ohm resistor, and the expression of the instantaneous value of the current passing through the resistor What steps should be taken
8. The angular frequency of sinusoidal alternating current is the frequency of alternating current?
9. Given a vector = (3,5, - 4) and B vector = (2,1,8), then a · B =? The sine value of the angle between a and B is? | a + 2B? =? What is the unit vector collinear with 2a-b? (I can do it, but I can't work out the answer. Help me to do it, and wait for the answer.)
10. Is degree a real number? In trigonometric function, the reason why degree is converted to radian is that radian is a real number. That means that degree is not a real number. What is degree, a quantity with unit, is it a real number?
11. Whether the superposition principle is suitable for nonlinear circuits, and explain the reasons
12. In a linear circuit, does the voltage and power of each element satisfy the superposition theorem
13. Why can't circuit superposition theorem be applied to nonlinear circuits?
14. When the sinusoidal alternating current passes through a resistance of 200 ohm, the Joule heat generated in 10 cycles is 4000j What are the effective value and frequency of the alternating current
15. In physics, in the chapter of Ampere's loop theorem, H = B / u formula, what does h mean and what is the relationship between H and B
16. What is the content of Ampere's loop theorem?
17. Under the action of electromagnetic field, human body will be injured in different degrees due to voltage () right or wrong
18. Under the action of radio frequency electromagnetic field, biological body absorbs certain radiation energy and produces biological effect
19. In the microwave circuit, why is the length of the transmission line added in the impedance matching selected quarter wavelength? Why?
20. In pure resistance AC circuit, () In pure resistance AC circuit, () A. The same frequency of voltage and current B. Voltage and current are in phase C. Different phase of voltage and current different frequency of voltage and current