Recent content by Ahmedzica

Thanks psparky!

What is the power formula for 3-phase Y connected motor. I've read that P = sqrt(3) Vt*Ia*Cos(theta) and P = sqrt(3) Vt*E*sin(sigma)/Xs Where sigma is the the angel between Vt and E Is that 2 formulas hold true for both delta and star connected 3 phase motor? and if so, Where the...

Thanks alot!

is this means that torque is proportional or inversely proportional to the cube of speed the problem says The torque of a load driven by a 385-V, Dc shunt motor varies as the cube of the speed. The current taken by the motor is 51A at a certian speed. Calculate the additional resistance...

what do you think of this https://dl.dropboxusercontent.com/u/49829206/Photo%20May%2006%2C%205%2007%2025%20PM.jpg I've solved it but I can not know what is the function of D2 and D3, could you tell me,please?

yes that's what I thought.. I solved it as the one right here http://people.seas.harvard.edu/~jones/es154/lectures/lecture_7/DL_DTL/ls_dl.jpg

it isn't the same.. as they the anode of the output diode connected to voltage source

yes you're right .. I'm sorry

oh Sorry ... here is it https://dl.dropboxusercontent.com/u/49829206/skitch.jpg

Hi Guys, I'm solving a DRL related problem https://dl.dropboxusercontent.com/u/49829206/skitch.jpg I though the output diode were in forward . but I suddenly noticed that it's in reverse .. so I couldn't handle the answer. can anybody help,please?

Hi guys, I was solving this problem using backward interpolation https://dl.dropboxusercontent.com/u/49829206/1.PNG and I got this solution https://dl.dropboxusercontent.com/u/49829206/3.PNG but What I don't get is that how come is the the forth difference is constant while it not in real...

Homework Statement Prove that (A x B) . (u x v) = (a.u) (b.v) - (a.v)(b.u) The Attempt at a Solution I've used lagrange indentity to proof that. but I can't go ahead Thanks