Recent content by pokie_panda

Homework Statement A 200 MHz signal is to be transmitted over a point-to-point wireless link. Assume the earth’s surface is flat over the entire propagation distance, and is 700 metres above sea level. The transmitter is at ground level, and the receiver is situated on top of a multi-storey...

Homework Statement The switch in the circuit in the figure has been open a long time before closing at t=0. Find iL(t) t>0 Express your answer in terms of t, where t is in milliseconds. https://www.flickr.com/photos/84781786@N03/8899251427/ The Attempt at a Solution We simplify...

Homework Statement Can you check if the values and labels are correct Homework Equations The Attempt at a Solution

so is this correct calculation 30V<-90 = I * 15 ohms I = 2A<-90 The 15 ohm || 30 ohm = 10 ohms, the 2A<-90 || 4A<90 = -j2 +j4 = j2 = 2<90 the 10 ohm || +j10 ohm = ((10) * (+j10)) / (10 +j10) = (+j100) / (10 +j10) = 5 +j5

Because we are simplifying we combine the resistor 15 Using 15 + (ZR*ZL)/(ZL+ZR)

I just copied the function off the question, I'm assuming it's negative Therefore V(t)=3<-60 I(t)=39.439√2<-20.4 Z= V/I =.0537<-39.6 X=3/29.432sqrt(2)sin(-40.4) .0537 -j0.03486 Is that part correct

Homework Statement Use source transformation on the voltage source and series-connected impedance for the circuit shown here to find the equivalent current source and parallel-connected impedance. Continue the simplification by combining the two parallel current sources into an equivalent...

Is this what your trying to say ? So Vrms = 3/√2 Therefore solve for Irms which is 54 = 3/√2Icos(40.1) I=1.66 Z=(3/√2) / 1.66 Then find Z but you don't have an imaginary part ?

Homework Statement The load (Z) in the circuit below absorbs a complex power of 54+j46 VA when the voltage across it is 3cos(400t+-60)V. Use this information to determine the impedance of the loadHomework Equations P = V^2 / Z The Attempt at a Solution first convert V to polar form 3 <...

Homework Statement A load operates at a voltage of Vx = 125V-rms and absorbs P = 55W andQ = 26VAR of power. Use this information to calculate the apparent power (S) and the power factor (pf) for the load. Homework Equations S = sqrt [ P^2 + Q^2] pf = P / S The Attempt at a...

Homework Statement Calculate the average power (P) absorbed by the load shown below when its impedance is 56 +j15 ohms 21 A rms? Answer to three significant figures Homework Equations P=Irms^2*RThe Attempt at a Solution Converting 56 +j15 to polar form yields 57.9741 ohms @ 14.9951 degrees...

Homework Statement power factor leading or lagging v(t)=3.5cos(600t-120) i(t)=2.3sin(600t+45) Homework Equations pf=cos(Vθ-Iθ) The Attempt at a Solution pf=cos(-75) =.25881905 I get confused, How do we figure out whether it leads or lags.

I ended up getting the correct solution , thanks for your help

Homework Statement http://www.flickr.com/photos/84781786@N03/8687383259/in/photostream/ Homework Equations Vc=Vsource*Zeq/(200+Zeq) The Attempt at a Solution Is this the correct way to get Zeq 100Ω and inductor as series . so we 100+j100 parallel with the capacitor. which...

Don't worry i figured it out