How to get the image effective value of sine alternating current Is the maximum divided by the root 2 half cycle or one cycle?

Half cycle

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1. Maximum and effective value of alternating current (sine) The derivation of the relationship between maximum and effective value
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3. Solution: sine alternating current effective value Emax = root 2E effective, integral derivation process
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8. What is the difference between Q in I = q / T and Q in I = (qnsvt) / T What do Q and Q stand for
9. 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?
10. 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
11. On the homeostasis expression of alternating current When to use EM = coswt, when to use EM = sinwt?
12. On the formula of alternating current What is the meaning of sin ω t in the formula of alternating current e = e (m) sin ω t? Is it sin ω * t or sin ω t?
13. Derivation of several effective value calculation formulas of alternating current Sinusoidal alternating current U = um / √ 2, Sinusoidal half wave alternating current U = um / 2, Sinusoidal unidirectional pulsating current U = um / √ 2, Rectangular pulsating current U = √ (T / T) um, Asymmetric alternating current √ (1 / 2 * (U1 ^ 2 + U2 ^ 2))
14. How is the maximum value of alternating current EM = NBS ω derived?
15. The derivation of the alternating current formula e = 2blvsinwt = bswsinwt in senior two physics,
16. As shown in the figure, a circular coil with a radius of R = 10cm has a total of 100 turns and rotates uniformly at a speed of n = 600r / min around the central axis OO 'perpendicular to the direction of the magnetic field in a uniform magnetic field with magnetic induction B = 5 / π 2 & nbsp; t, The timing starts when the coil turns to the neutral plane. (1) write out the instantaneous value expression of the alternating electromotive force generated in the coil. (2) calculate the instantaneous value of the electromotive force when the coil passes 1 / 60s from the position shown in the figure. (3) calculate the average value of the electromotive force when the coil passes 1 / 60s from the position shown in the figure;
17. What is the unit of "ω" in the formula of alternating current e = NBS ω sin ω t? Is the unit of "ω" rad / S? Then why do some students say that they have to multiply it by a 2 π when doing the problem? For example: ω = 200 rad / s, do they need to change it into ω = 400 π rad / s when doing the problem?
18. According to the uncertainty transfer formula of indirect measurement, which physical quantity has the greatest influence on the acceleration of gravity is analyzed Simple pendulum method. Need to give reasons
19. The Chinese teacher went to the blackboard to wipe the blackboard, but he couldn't find it. The teacher asked: who knows where the eraser is? No one answered In the second Chinese class in the morning, the blackboard was full. The Chinese teacher went to the blackboard to wipe the blackboard, but he couldn't find it. The teacher asked: who knows where the eraser is? No one answered "Have the students on duty cleaned the blackboard after the first class?" "Yes, it's on the slot of the blackboard after cleaning," the student on duty replied "So who moved again?" the teacher asked No one answered. Some of the students were laughing, some of them were elated, and their eyes glanced at the top of the blackboard from time to time. Suddenly, the teacher understood everything. Someone was playing a prank and hid the blackboard eraser \If you are the teacher, how will you deal with this incident?
20. If the gravity of the eraser is known to be 1.5n, the attraction between the eraser and the blackboard is constant 4N. When a thrust of 0.5N is applied to the eraser, the eraser can slide along the blackboard surface at a constant speed. If the eraser is to slide along the blackboard surface at a constant speed, a vertical upward force should be applied. The force is 0.5N___ ___ N．