Thanks for that
So would it be along the lines of:
V=141.1sin(240πt)+28.3sin(720πt)+14.1sin(1200πt-1.2)
How I am working out the voltages is using above formula, This is how I worked out first section but pretty sure I am going around this the wrong way
141.1sin = .268
240 x π x...
Homework Statement
An a.c. voltage, V, comprises of a fundamental voltage of 100V rms at a frequency of 120Hz, a third harmonic which is 20% of the fundamental, a 5th harmonic which is 10% of the fundamental and at as phase angle of 1.2 radians lagging.
1. Write down an expression for the...
Hi
Im stuck on the same question. I've been using 141.4sin(2pi x f(120) x 0.02), which gives me 9.41v
28.3Sin(2pi x 360 x 0.02) = 21.45v
14.1sin(2pi x 600 x .02 - 1.2) = 18.08v
Then added these up to give combined voltage at 20ms of 48.93v
This is obviously a diffenrent answer to answers...
Homework Statement
A single phase transformer has the following rating : 120kVA. 2000v/100v, 60 Hz with
1000 primary turns.
Determine:
a.Secondary turns
b.The rated primary and secondary currents
Homework Equations
Vp/Vs = Np/Ns
The Attempt at a Solution
a. I have used...
Yeah I thought 8 seconds seemed a long time, that's what made me query if I had gone about it right.
The question is typed exactly as I have been given with those units, then I have used what I think is Faradays law:
E (volts) = N (number of turns) x change in flux (Webers) / Time (s)...
1. Homework Statement [/b]
If the magnetic flux linking all the turns of a 50 turn coil changes from 10mWb to 20mWb and induces an emf of 62.5V in the coil, calculate the time over which the flux changes.
Homework Equations
e=Nd x change in flux / dt
The Attempt at a Solution
Not...
Thanks for that gneil
Yeah the n is for the plates.
Am I right in assuming the answers are in meters^2 for the first part?
Could you also tell me if everything looks ok on the remaining answers.
Many thanks
Homework Statement
A multi plate variable capacitor has 4 pair of plates. The plates, when closed, are separated in air by 0.01mm and a capacitance range of 10 to 400pF.
a) Estimate the required radius R of each plate.
b) The capacitor is set to maximum 400pF and is charged to 10V...