Hi guys thanks for the replies sorry its so vague i did it all on a word doc importing graphs and the equation etc thinking i could post it but the uploader won't work.
the units for the constant Kc are in Newtons but it has an A to the minus 1 after it.
ill try and post it from home it...
Homework Statement
Basically its all on the attached sheet as i don't know how to stick images in the post.
im having trouble finding two distances x and y (x+y= 100mm) just need a little help rearranging the equation on the attached word doc.
But ‘A’ passes through origin...
Homework Statement
Determine the value of the ballast resistor is satisfactory if a 5Volt 0.5 watt zener diode is used in the circuit
sorry can't upload a picture but basically
VS = 15v min to 20v max
R ballast = 90 ohms (series with zener)
and R load (in parralel with Zener) is 50...
Homework Statement
two alternating currents I1 and I2 flow into a circuit node,the output current I is given by adding I1 and I 2.
find I and t, when I1 and I2 are as follows
Homework Equations
I1=5sin(50t +Pi/3)
I2=6cos50t
The Attempt at a Solution...
Man you so know your stuff. Thanks for the reply I am going to re do the lesson and take on board what you have said to see if i can figure it out
thanks ian
Homework Statement
for the thyristor circuit calculate the power in the load as a percentage of max power for a firing angle of 45^
Homework Equations
Va=Vm/2pi (1+cos theta)
The Attempt at a Solution
theta=arcos 0.707
45^=arcos 0.707
but as there is no value for VS or Vl i...
hello there right i think I am on to something now my final expression is
Vo=100+980 sin (1600pi t)-100 cos(3200pi t)
100 is the dc term
1600hz is the fundamental
and 3200hz is the second harmonic
it now asks for the percentage second harmonic distortion present in the output
need...
Sorry man I am lost, i have just started this open learning course after being out of education for 15 years i have managed to answer th efirst 5 questions of my assignment fine as the lessons had enough examples for me to practice on however the lesson I am on with now only has 1 in a different...
grateful for the reply.
i foujnd this on the net
"From basic trigonometry the square of a sinusoidal input is a DC shifted sinusoid of twice the input frequency"
this is the second harmonic i believe Vi=10mv sin (1600pi t)?
i know i need to have a cos wave something like 1/2cos(3200pi...
Really stuck with this one any help appreciated
Homework Statement
a voltage amplifier ideally should have the relationship Vo=100vi
but in practice is Vo=vi(98+ (2/.001) vi)
determine the expression for the output voltage when a 10mv peak 800hz sinusoidal input signal is applied...
Hello Alfie
how did you get on with that question I've had a similar problem relating to it as you did but I am now on the next part which asks for the size of capacitor to bring the circuit to unity, but my calcs infer it is a smaller sized capacitor than the one that reduces it by 20%...
does this apply to the primary current also
primary voltage of 240volts from a 28VA transformer will produce .116 amps...
e.g., 28 VA ÷ 240 Volts = .116 Amps.
thanks for you help in this