Recent content by agata78

Can you help me more, i have 2 hours to solve it!

ok i know where i made a mistake. I really need online calculator! thank you!

I had to calculate partial fractions cause my table is rubbish. A= -6/5 B= 3/5 What to do next? (-6/5 )/s + (3/5) (10+2s) i(t) = -6/5 +( 3/10)e -2t The answer should be 0.6(1-e -5t) Could you tell me where i made mistake?

ok, I(s)=6/ (s(10+2s))= 3/ (s(s+5)) I(t)= 3+ 3e -5t = 3(1+e -5t) Am i right ? And what next? I think i will have to deal with partial fractions. Is= 3/ s(s+5)= A /s + B / (s+5)

I found a very similair example, but don't know how to use my numbers. I am running out of the time now. Can you help? The voltage, V, will be the sum of the two voltages, VR and VL. Where VR = Ri(t) and VL = L(di(t)/dt). Thus, 6 = VR + VL = 10i(t) + 2 di(t) /dt...

Could you please help me with net impedance, i can't find equation for it? And I am stuck!Z= (R+ jwL) + (1/ ( jwC)) how can i calculate j for this equation?

The question states: SUBJECT TITLE: Calculate circuit responses to a step input in practical situation Calculate the circuit response for the circuit in the figure. However, at the back of the question paper it says: To achieve a Merit you will demonstrate the ability to: M2...

Homework Statement Use Laplace transforms to derive an expression for the current flowing in the circuit shown in the figure, given that i = 0 when t=0 Homework Equations Expression for the current in an LR series circuit I(t) = V / R (1-e-Rt/L) V - Volts (6V) R - Ohms (10Ω) L...

Homework Statement Calculate RLC circuit responses to a step input? I believe the step input needs to be 10V. Homework Equations Series RLC Characteristic Equation: S2 + S(R/L) + 1/LC = 0 Putting the above equation into standard form: S2 + 2αS + ω02 = 0, it follows that...

Yes i was actually trying to ask you why would i have to calculate it again. Hurrayyyyy! Thank you so much for help all the way! One to go!

the only way it could be is: 20-20e(-2t)

I used this website to educate myself a bit more then i remembered from school www.mash.dept.shef.ac.uk/Resources/web-partialfractions.pdf But does it matter which way i used to calculate A and B. i(t)= 20e 1 + (-20) -2t But what next?

I don't know if I am doing that right, after some calculations i have if s= (-2) then B=-20 and if s = 0 then A= 20 is it ok?

40 / s2 +2s = -8+16s am i right so far? What you mean by split the expression? which expression ?

Im stuck now, I out of ideas what to do next. Help!