Struggling... please help!

[cruyffturn]

The current in an a.c. circuit at any time t seconds is given by:

i=sin(100πt-0.432)a

Determine

(a) the amplitude, frequency, periodic time and phase angle (in degrees),

(b) the value of current at t = 0,

(c) the value of current at t =8ms,

(d) the time when the current is first a maximum,

(e) the time when the current first reaches 3A. Sketch one cycle of the waveform showing relevant points.

 

[Dr.Peterson]

Please show us your struggles! We need to see where you need help, in order to give the most effective help. What have you tried, and what went wrong?

Be sure to follow these guidelines:

Posting Guidelines (Summary)

Welcome to our tutoring boards! :) This page summarizes main points from our posting guidelines. As our name implies, we provide math help (primarily to students with homework). We do not generally post immediate answers or step-by-step solutions. We don't do your homework. We prefer to help...

www.freemathhelp.com

 

[Deleted member 4993]

The current in an a.c. circuit at any time t seconds is given by:

i=sin(100πt-0.432)a

Determine

(a) the amplitude, frequency, periodic time and phase angle (in degrees),

(b) the value of current at t = 0,

(c) the value of current at t =8ms,

(d) the time when the current is first a maximum,

(e) the time when the current first reaches 3A. Sketch one cycle of the waveform showing relevant points.

Do you know the definitions of:

the amplitude,​

​

frequency,​

​

periodic time and​

​

phase angle (in degrees)​

​

Apply those definitions to the given equation.

Please show us what you have tried and exactly where you are stuck.

Please follow the rules of posting in this forum, as enunciated at:

https://www.freemathhelp.com/forum/threads/read-before-posting.109846/#post-486520

Please share your work/thoughts about this assignment.

 

[topsquark]

The current in an a.c. circuit at any time t seconds is given by:
i=sin(100πt-0.432)a

Just for clarity (because I've never seen anyone write it this way) you mean
[math]i = a \cdot sin( 100 \pi t - 0.432 )[/math]right?

Is this the whole problem? You need a numeric value for "a" to do the problem.

-Dan