All the formulas involved in 2

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13. Senior high school physics compulsory 1 Chapter 2 Formula Please, as long as the second chapter of the formula, with some explanation, thank you
14. Why does the voltage at both ends of option D decrease? My analysis is: in Figure B, if the resistance is R and the total resistance is ignored, it is R / 3. Compared with figure B, the resistance in Figure C is 3R / 2 and the resistance increases, so the total current decreases, the voltage in the power supply decreases, the terminal voltage increases, ur1 decreases, and the voltages of R2 and D increase and are equal
15. The storage ring of Beijing Electron Positron Collider (BEPC) is an approximate circular orbit with a circumference of 240m. When the current generated by electrons flowing at the speed of 110% of the speed of light is 10mA, the number of electrons running in the ring is (known speed of light C = 3 × 108 & nbsp; m / s, electronic charge e = 1.6 × 10-19 & nbsp; c) () A. 5×1010B. 5×1011C. 1×102D. 1×104
16. In a complete circuit, if a section of wire has no resistance, that is, no voltage, then from the micro point of view, in the circuit, the electrons moving along the direction of the electric field form a current, and the voltage of that section of wire depends on the work done by the electrostatic force. With the change of electric potential energy, as long as the electrons move in a directional direction, there must be voltage. Isn't that contradictory?
17. The total energy released in the internal and external circuits is determined by () A. Electromotive force of power supply B. current through power supply C. terminal voltage D. sum of internal and external resistance
18. In the microscopic expression of current: I = NESV, s refers to the cross-sectional area. In the definition formula: I = q / T, it is said that it has nothing to do with the cross-sectional area. What is the reason?
19. What is the difference between Q in I = q / T and Q in I = (qnsvt) / T What do Q and Q stand for
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