Welcome to our concluding wrap up of module five which is the final module of
our course in linear circuits. Going back to our concept map we saw that
for power we made use of the maximum power transfer from resistive circuits
and impedance in phasors from frequency analysis to do power analysis.
We looked at apparent power, reactive power, the power factor, and
transformers. In discussing, power, and how it, how it
operates. To cover some of the important concepts
and skills that you should be able to, to recognize and, and perform.
First of all, for root mean squared. You should be able to calculate the root
mean squared of a periodic function. And recognize that root mean square
values are invariant to the frequency. It's basically a function of the shape.
You should be able to use a known RMS equation to find RMS values, given the
peak values and visa versa, you should be able to find the peak values given the
RMS values. From power factors and power triangles,
you should be able to calculate complex power either from the equations for the
voltage and current themselves, or from phasors represented of that voltage and
current. You should be able to generate power
triangles. And then using power triangles, be able
to find apparent power with is [UNKNOWN] by modular s or the absolute value of s.
The real or average power, P, the reactive power, Q, the power factor and
the power angle. Using the phase angle, you should also be
able to identify if a load is resistive, capacitive, or inductive.
Resistive for zero, capacitive for a negative and go inductive for a positive.
From the equations you should also be able to identify if a load is resistive,
capacitive, or inductive. You should be able to do the same thing
given a graph of the voltage and the current.
You're supposed to be able to recognize if a system is leading or that the
current leads the voltage or lagging, that the current lags the voltage.
For maximum power transfer you should be able to calculate the impedance which
gives maximal power transfer, the complex conjugate of a [INAUDIBLE] impedance.
You should be able to calculate the average power consumed when the load
gives maximal power transfer and you should be able to find the optimal purely
resistive load for constrained maximum power transfer.
As well as be able to find the average power that is consumed by that resistive
load. And from transformers, we describe the
physical effects, which make transformers work, and you should briefly be able to
describe that behaviour. You should be able to use the linear
model to analyze the circuit with the transformer, as well as the ideal model.
To analyze a circuit with a transformer. You should also identify circumstances
when a transformer is an appropriate device to be used in a system when you're
wanting to, for example, change voltages. You should also be able to explain the,
how using transformers facilitates long distance power distribution, allowing
large voltages and small currents. This will lead to smaller voltages and
larger currents for power line transmission so you don't lose so much as
heat and currents through the wires. You should also be able to describe why
transformers do not typically function for direct current systems.
And then finally, identify, using amplitude and phase, the relative
displacement of a linear variable differential transformer.
So this concludes module five, and that is the final module of our section on
linear circuits. Now this should give you enough
information that from this point you should be able to go forward and start
looking at some non-linear systems. So you can start looking at things like
diodes and transistors. So these are a little bit more
complicated devices that are commonly used in electrical systems.
But, from this point, you already know a lot about how voltages and currents work,
as well as linear devices. And so you can actually start, perhaps,
applying these to, for example, little projects that you might be interested in
doing. Hopefully, you enjoyed the material that
was presented in this course. If you have any feedback or comments on
the material that was presented I eagerly encourage you to go to the forums and
post your, your thoughts there. Look forward to getting feedback from how
you enjoyed the course. The things that you found very useful and
the things that you found less useful. So we can improve the way that this
material is presented in the future. Thank you very much for your
participation in the course, and congratulations.
This was not an easy course. There was a lot of material that was
presented. And if you made through the conclusion,
it's quite an accomplishment, and you should be proud of your accomplishment.
So, look forward to perhaps seeing you in subsequent lectures and otherwise I will
see you on the forums. Take care.