Explain the meaning of electricity

Electricity is a kind of particle. Voltage plays a role in pushing (free) electrons to move directionally. Only in conductors can there be electrons that can move freely. That's why conductors can conduct electricity. Electrons produce various forms of energy in the process of moving. Electrical appliances are machines that use these energies

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1. #define TAILQ_ INSERT_ AFTER(head,listelm,elm,field) do { \ if ((TAILQ_ NEXT((elm),field) = TAILQ_ NEXT((listelm),field)) = NULL)\ TAILQ_ NEXT((elm),field)-> field.tqe_ prev = \ &TAILQ_ NEXT((elm),field); \ else \ (head)->tqh_ last = &TAILQ_ NEXT((elm),field); \ TAILQ_ NEXT((listelm),field) = (elm); \ (elm)-> field.tqe_ prev = &TAILQ_ NEXT((listelm),field); \ } while (0)
2. In △ ABC, a, B and C are the opposite sides of angles a, B and C respectively. Given vector M = (a, b), vector n = (COSA, CoSb), vector p = (2 √ 2Sin (B + C) / 2,2sina), if vector m ‖ vector n, vector p ^ 2 = 9, we prove that △ ABC is an equilateral triangle
3. A vector a and B, if a & # 178; = B & # 178;, then a = B or a = - B The answer is wrong, but I don't know why,
4. The vector a module is root 3, the vector b module is 1, and the angle between a and B is 30 degrees. Find the angle between vector (a + b) and vector (a-b)
5. A high school compulsory 4 vector problem Given that the area of triangle ABC is 100, points D and E are the points on edge AB and BC respectively, and ad: DB = Ce: EB = 2:1, AE and CD intersect at point P, the area of triangle APC is calculated? It's best to use vector computation
6. Is magnetic flux scalar or vector
7. Magnetic flux Φ = bxs, Φ is scalar, B and s are vectors. How can I determine the direction of S
8. Is work a vector or a scalar? Why According to w = flcosa Where f and L are all vectors, is the resulting w also a vector? Excuse me, if the right direction is defined as the positive direction, the object is still on the horizontal table, it is pulled 5 N horizontally to the left, and the object moves 5 m to the left, then the work done by the pulling force on the object is w = FS = 5 * - 5 = - 25J So, what force does is not negative work? And the pulling force is the motive force. According to the principle, we should do positive work. How to explain? Good answer, increase the reward
9. Are magnetic flux and magnetic field intensity vector or scalar respectively? Why?
10. Is power p a scalar or a vector? Why is there no direction? P = f / T, isn't f a vector? Is the dot product of two vectors scalar? Why?
11. Maxwell's law of total current: ∮ l HDL = I (total), who can explain the meaning of the integral part on the left side of the equal sign Such as the title
12. Vector, how many kinds of explanation, its basic meaning is what, in UG vector is what consciousness, new people for guidance
13. We know that vector a = (cos3 / 2x, SIN3 / 2x), vector b = (cosx / 2, - SiNx / 2), and 0 The second question f (x) = (vector a dot multiplied by vector b) - 2 times m multiplied by (absolute value of a + b) The minimum value of F (x) is - 3 / 2, and the value of real number m is obtained
14. On the sides OA and ob of the triangle OAB, there are two points P and Q respectively. It is known that OP: PA = 1:2, OQ: QB = 3:2, connecting AQ and BP. Let their intersection be r, if the vector OA is vector a and the vector ob is vector B Use vector a and vector B to represent vector or
15. urgent It is known that the vertex of △ ABC is a (0,0) B (4,8) C (6, - 4) point m on the line AB, the tangent vector am = 3MB, the point P on the line AC, and the area of △ APM is the general of △ ABC. The coordinates of point P can be obtained
16. Given 2A + B = (- 4,3), a-2b = (3,4), find: (1) the coordinates of a and B; (2) | a + B | All letters are vectors
17. The definition of scalar and vector in Physics Please specify and list the related items. Thank you!
18. What are vectors and vectors?
19. What's the difference between vector and vector?
20. The difference between vector and vector~~ What's the difference between vector and vector, or do they mean the same thing?