It is known that the expression of sinusoidal voltage U is u = 10 root 2 sin (WT + 30 °) V, and the effective value of voltage U is obtained=____ v. The initial phase is___ .

It is known that the expression of sinusoidal voltage U is u = 10 root 2 sin (WT + 30 °) V, and the effective value of voltage U is obtained=____ v. The initial phase is___ .

U = 10V, initial phase - π / 3

Given the sinusoidal AC voltage U = 220sin (314t-30 °), the angular frequency is
(a) 30 (b) 220 (c) 50 (d) 100 π which answer is right?

This problem d is right. Sinusoidal AC voltage can be expressed as u = a * cos (WT + C), W is angular frequency, C is initial phase, in this problem, w = 314 = 100 π

On the generating formula of sine function
Take the following formula as an example
#FS / / define 32Hz
For (I = 0; I < 32; I + +) / / sampling times
value[i] = sin(2 * Pi /Fs * i);
Here, the required parameter of 2 * pi * 1 / Fs * I, sin () is radian. I remember radian = angle * π / 180 = * t, I don't know how to deduce it
Is it true that sin (2 * pi * F1 * I / Fs) = sin (w * t) = sin (2 π F1 * (I * (1 / Fs)), but the frequency of the sine is 1Hz?

Sine function refers to the ratio of the opposite side of a right triangle to the hypotenuse. For example, in RT right triangle ABC, the lengths of the opposite sides of angle a, angle B and right angle c are a, B and C respectively
sinA=a/c
sinB=b/c.