Recent content by ckeller

Homework Statement A range of metallic alloys are tested for electrical conductivity and give the following results for identically sized samples. 25% copper with 75% tin gave a reading of 0.0071 Ohms 65% copper with 35% cadmium gave a reading of 0.0049 Ohms 40% copper with 40% tin...

I got [15-cos(200pit)/pi + C] does that look right? And then calculate between 5 and 10 ms

Oh yeah thanks, that is useful to know! so I don't need to integrate 15sin(200PIt)?

Homework Statement The voltage at a point in a circuit is represented by the function v = 15 sin (200πt) volts. Use integration methods to calculate; (a) The average voltage between t = 5ms and t = 10ms (b) The average voltage between t = 0 and t = 10ms (c) The r.m.s. voltage between t...

Homework Statement Hi, I am slightly confused by which variation of phase angle formula to use relating between the current and voltage. Would this still be (tan-1 XL-XC/R) for a RLC parallel circuit? Voltage = 90V ac Xc/Z1 = (9 - j4) XL/Z2 = (12 + j15) Current = 11.27 Amps Total...

Ah I will remember that thanks! I think I've worked it out... Rs^2 + Xs^2 / Rs = Rp (Rs being series resistance, and Rp being parallel resistance) which comes to 2.331 kΩ I also used Rs^2 + Xs^2 / Xs to calculate the Parallel Reactance which came to 861.326Ω By using 1 / 861.32*2PI*700...

I think in other words..how would you get the same Impedance changing from a series RC circuit to a parallel RC circuit?

Hey thanks for your reply, I will look into that. It's not homework, just a practice question I was unsure of :)

Hey there, I have a question to answer and I'm unsure what exactly it is asking for, could anyone shine some light as to what this means? Is it two RC circuits in parallel?? "A circuit consisting of a 280 Ohm resistor in series with a 0.3 uF capacitor is connected to a supply operating at a...