Recent content by tommoturbo

HI guys here is the notes i have which should clear things up i hope

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...

Yeah i understand that but sadly i don't understand it enough il keep on at it and try again thanks

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%...

Brilliant thanks for the advice :)

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