0:08

Going back to our concept map, we saw that for

Â power we made use of max power transfer from resistance circuits and

Â impedance in phases from frequency analysis to do power analysis.

Â We looked at apparent power, reactive power, the power of factor and

Â transformers in discussing power and how it operates.

Â 0:27

So it covers some of the important concepts and

Â skills that you should be able to recognize and perform.

Â First of all for root-mean square,

Â you should be able to calculate the root-mean square of a periodic function.

Â And recognize that root-mean square values are invariant to the frequency,

Â it's basically a function of the shape.

Â 0:58

From power factors and power triangles, you should be able to calculate complex

Â power either from the equations for the voltage and current themselves, or

Â from phasors representative of that voltage and current.

Â You should be able to generate power triangles.

Â And then using power triangles, be able to find apparent power,

Â which is designated by modular S or the absolute value of S.

Â The real or average power P, the reactive power Q,

Â the power factor and the power angle.

Â 1:28

Using the phase angle, you should also be able to identify if a load is resistive,

Â capacitive, or inductive, resistive for

Â zero, capacitive for a negative angle, and inductive for a positive angle.

Â From the equations, you should also be able to identify if a load is resistive,

Â capacitive or inductive.

Â You should be able to do the same thing given a graph of

Â the voltage and the current.

Â 1:59

For maximum power transfer, you should be able to calculate the impedance which

Â gives maximal power transfer, the complex conjugate of the feminine impedance.

Â You should be able to calculate the average power consumed when the load gives

Â maximal power transfer.

Â And you should be able to find the optimal purely resistive load for

Â constrained and maximal power transfer, as well as be able to find

Â the average power that is consumed by that resistive load.

Â 2:23

And from transformers, we describe the physical effects which make transformers

Â work and you should be able to briefly describe that behavior.

Â You should be able to use the linear model to analyze a circuit with the transformer,

Â as well as the ideal model to analyze a circuit with a transformer.

Â You should also identify circumstances when a transformer is an appropriate

Â device to be used in a system, when you're wanting to, for example, change voltages.

Â 2:46

You should also be able to explain how using transformers facilitates long

Â distance power distribution, allowing large voltages, and small currents to lead

Â to larger or smaller voltages and larger currents for powerline transmission.

Â So you don't lose so much as heat in currents through the wires.

Â Should also be able to describe why transformers do not typically function for

Â direct current systems.

Â And then finally, identify using the amplitude and

Â phase, the relative displacement of a linear variable differential transform.

Â 3:18

So this concludes module five.

Â And that is the final module of our section on linear circuits.

Â Now this should give you enough information that from this point you

Â should be able to go forward and start looking at some non-linear systems.

Â So you can start looking at things like diodes and transistors.

Â So these are a little bit more complicated devices that are commonly

Â used in electrical system.

Â But from this point you already know a lot about how voltages and

Â currents work as well as linear devices.

Â And so you can actually start perhaps applying these to, for example,

Â little projects that you might be interested in doing.

Â Hopefully, you enjoyed the material that was presented in this course.

Â If you have any feedback or comments on the material that was presented,

Â I eagerly encourage you to go to the forums and post your thoughts there.

Â Look forward to getting feedback from how you enjoyed the course,

Â the things that you found very useful and the things that you found less useful, so

Â we can improve the way this material is presented in the future.

Â Thank you very much for your participation in the course, and congratulations.

Â This was not an easy course.

Â There was a lot of material that was presented and

Â if you've made it through the conclusion, it's quite an accomplishment and

Â you should be proud of your accomplishment.

Â So I look forward to perhaps seeing you in subsequent lectures.

Â And otherwise, I will see you on the forums.

Â Take care.

Â