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EI1120 Administrative information (KursPM)
Please read this page carefully!
This page is particularly important because it explains what you have
to do in order to get through the course.
It is an online "KursPM" document that describes details such
as registration, timetable, contact details for teachers,
requirements about exams and homework, etc.
Schedule
The
EI1120-VT16 Schedule
shows dates and rooms for course events, such as lectures and tutorials.
More about the subjects for each lecture, tutorial and lab can be seen in the
table on the homepage, and in more detail by getting
the files (e.g. the chapters covering the topics, and also
the notes, exercises and homeworks when they appear).
Disability
Support via Funka:
if you have a disability, you may receive support from
Funka.
Support from teachers: Funka does not automatically inform the teacher, so we
recommend you inform the teacher regarding any need you may have that is not
met by Funka.
Admin: registering for the course and exams
The Student Office, STEX, is the place to contact with all
questions about registrations to the courses and exams:
e.g. late registration, web-based registration not working,
problems with viewing marked exams, etc.
See the
STEX webpage
for contact details: email to stex@ee.kth.se
is a convenient choice.
These sorts of administrative questions should not initially come to
the course teachers -- we do not even have access to some features of the
administrative systems, and the rules and details are complex beyond our
comprehension.
You should register for the course as soon as you start it.
For new registrations, use Mina Sidor.
If you're repeating the course you should re-register,
by emailing STEX or visiting STEX (see above).
For exams (tentor), re-exams (omtentor), and mini-exams (kontrollskrivningar),
registration should be made at least 16 days (note the change -- it
used to be 14 days) before the event.
This is also done through Mina Sidor.
Registration to tests is important in order that there are
sufficient rooms and staff. If you are not registered you
have no guarantee of a place, and may have to wait (e.g. 45 minutes)
to see if a registered student fails to arrive to their place.
If you've forgotten to register, then at least email to STEX as
soon as you can, to increase the chance of there being enough places.
When multiple rooms are booked for these events, you will
normally be contacted by email sometime on the day before
the test, to tell you which room you will be in.
Teachers in the course
Nathaniel Taylor
Mahsa Ebrahimpouri Hamikar
Kun Zhao
Books
See the Books page for more information.
There is no book that you are supposed to use as the main course book.
The files provided on this website are the course literature,
along with questions and solutions from homeworks and past exams.
An old KTH compendium is suggested as a source of further practice
questions and correct Swedish terminology.
Exhortations about Working Habits!
From experience of circuits courses, the following advice is offered.
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It is important to keep up with the course. The Topics are not
a set of unrelated concepts. Almost every part of the course builds
upon (i.e. requires) the majority of the previous parts of the course.
If you fall behind, the next Topic will arrive, and you won't easily
understand it.
-
Actually doing circuit analysis -- solving problems -- is very
important to becoming competent at the subject.
Yes, it's also nice to read explanations and look at examples, but you
should also ensure that you can do circuit analysis by yourself.
A common story from students who fail the course is that they thought
they knew how to do it, because it seemed so obvious when they read
solutions to past exams or heard a friend explain it ... but because
they didn't actually try solving lots of new problems, alone,
unaided, with realistic time-limits, they never realised that actually
there were steps they did not understand!
-
Working in pairs or groups appears to be a very useful way to study
(for many people, although not all!). You can do study and homeworks
with friends, helping each other to understand the right way to go.
But make sure you first try solving some of the parts by
yourself, unaided, so that you really know how competent you are at it.
Use friends and model answers as the next step, after you've
tried it by yourself.
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Take advantage of the homeworks as a way to keep up to date with the
course material. Don't just try to finish and submit the homework with
the minimum work "because you have to". The main point of the homework
is to ensure that you have practised the material early in the course,
and that you are prepared for the later Topics, and that you keep an
up-to-date reality-check about your skill-level.
Study each homework and its solution as a way to get its Topic well
learned.
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If you have spare time during the course, start doing further exercises
in the subjects that you've already studied: you can find these in
past exam papers, textbooks, etc.
-
Take advantage of the exam structure. Although the mini-exams (KS) are
optional, you would be wise to work hard at these, to get good grades
in part of the course before the main exam. Then you have less
risk in the main exam, and more time to focus on its final part.
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Try hard to pass the course on the first time!
Our system is very "kind" at offering re-exams;
but this can be an unkindness if it encourages postponing (delaying) the
work in a difficult course.
By dropping such a course, and trying to take it in a later year, there
will be bad effects on later courses due to time taken in studying for
re-exams. It will also be more difficult to study some later courses
if you haven't yet achieved a high competence at circuit analysis.
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Don't be inhibited about avoiding things that seem a bad use of time,
even if other people appear to use them.
For example, if you like reading and thinking at your own speed without
disturbance, and can't concentrate in lectures or tutorials, then perhaps
it's best for you to miss these events and instead read and practice
by yourself or with a colleague.
Choose your best way of studying, as long as you manage to do the
required things of homeworks, labs and exams.
-
Beware of the temptation to spend time (and money) getting books, finding
videos, downloading pdf files, downloading whole websites with
wget
-mpk http://.....
, etc., in the belief that this will
help your study. There's a severe limit to what you have time to study
properly. It's probably better just to get on with the hard work of
doing the study with the existing materials that we provide, or
with one or a few other sources if you find those better.
It's thinking about and doing the problems that will most help you,
although sometimes of course you may find that one source helps you
understand the concepts better than another does!
Homeworks, old exam solutions, and some hard thinking without
distractions, will probably turn out more useful than a pile of
colourful textbooks or online videos.
-
Even if you don't like the subject, or find it very hard, try to find a
way to feel positive(!) -- here are some suggestions.
Think of your general skills you're improving, in algebra, checking of
reasonableness and dimensions, etc; these skills are useful in any
calculation-based work in physical science and technology.
Think of it as a training of your ability to be efficient and organised
in your studies: it's a useful skill to be able to focus hard on
something even when your motivation is just the long-term goal of
getting it properly finished.
Think of your studies as a job where you have a duty to spend (on average)
at least 40h/week of focused work, even it if seems amazingly boring; a
lot of your borrowed money and taxpayers' money is going into the process
of your education!
If you know that you can like technical things in this area, but are
finding the early years too theoretical and abstract, try to find out
more about the interesting third-year and masters-level courses that you
can later choose in your preferred direction ... you will probably be
surprised later to realise how useful the skills from practically
all the early theoretical courses can be for understanding
the more technically-interesting later courses.
Syllabus (content) and Aims
If you're looking for a Syllabus (list of "learning outcomes", purpose
of course, etc), it is probably most useful to look at the content of
the notes, homeworks and past exams of the last two years.
These give a detailed view of the included subjects and our emphasis, and
of the typical style of problems that we solve.
If you prefer formality, you can try the official
course-plan:
however, in view of the small space this inevitably cannot provide
much information about the style and level (note also that we
don't do much "mesh analysis" now).
The course is about analysis of linear circuits.
The main aim is to get competent at taking a circuit diagram and finding what
values certain variables such as voltages, currents and powers would have.
We will also sometimes look at the backward question of what parameters, such
as sources and resistors, should be chosen in order to make a variable have a
specified value.
We would like students to develop abilities in two rather different
approaches to circuit analysis. One is the "intuitive sense", of being
able to estimate some of the behaviour of a circuit from just looking
at a circuit diagram. The other is to use systematic methods to translate
a circuit diagram into a set of equations that allow a variable or parameter
to be determined. Both of these are useful for real situations, and they
are often used together.
In practical use of circuit analysis, the former skill is important for
making estimates and starting in the right direction with a design.
The latter skill is important for dealing with later stages of analysis where
more detail is needed, such as solutions of complicated circuits where we
have to program computers to generate and solve the equations.
The latter seems generally easier to train, particularly if the equations
are to be solved by computer.
In view of the large number of methods and concepts that we need to introduce
in this course, and the opportunity of developing more "feeling" for circuits
during practical applications in later courses, the course assessment is
designed without rigid demands about demonstrating skills of estimation
and conceptual thinking; however, some minor parts of exam questions can
benefit from these skills.
A circuit diagram represents an idealised model: for example, a voltage
source is assumed to give an exact voltage regardless of the current through it.
The diagrams are thus directly related to equations. Idealised circuit
analysis is basically a mathematical puzzle, with a special sort of
representation!
A large part of practically applied circuit analysis consists
in choosing a suitable model (diagram) for an actual circuit, then solving
the diagram (the straightforward part!), then analysing what the results means
the context of the actual circuit.
This can be surprisingly difficult; one has to decide what phenomena can
safely be neglected.
In this course we almost entirely omit the parts other than solving the
diagrams. The other parts could be very educational, but we do not have time
to deviate far from our quite idealised content.
In our limited time, we want to get good core skills at solving the diagrams.
Later courses will build on these skills, and apply them to the
more practical applications in power, communications, control, etc.
Students taking this course should also use it as an opportunity to
improve their general skills at checking the reasonableness of answers
by methods such as extreme cases ("suppose we set R to zero, ...") and
dimensional analysis. These skills are only required to a small extent
in the course's assessment, but some sort of checking should ideally be
used for all results; some credit is given for correctly identifying a
wrong solution as being wrong.
Checking is important in later studies and work, as well as in
homeworks and exams in the course.
Course structure
The course's subjects are divided into three Sections:
- Section A: Direct current (dc) (likström).
This corresponds to the subject of statics in mechanics.
We introduce some basic circuit components of resistors, constant-valued
sources of voltage or current, and later the operational amplifier.
Each of these components puts some constraint (requirement) upon a voltage or
current, or on the relation between voltages and currents.
The connection of components by nodes imposes further constraints, described
by Kirchhoff's laws. Together, all these constraints determine the
circuit's solution. We learn methods for simplifying a circuit and converting
it to equations that can be solved to find a desired value.
- Section B: Transients.
Some new components are now added:
the energy-storing components called inductors and capacitors are the
most important, but we also introduce switches, diodes, and components
whose value changes as a `step-function' at some time.
The circuit quantities, with these components present, become time-functions
instead of single values.
In general, differential equations must now be solved to get circuit solutions.
We look at equilibria and sudden changes from equilibria, and at simple cases
of finding time-functions.
- Section C: Alternating current (ac) (växelström).
AC analysis means an assumption that all voltages and currents are
sinusoidal time-functions; this is sometimes called harmonic excitation.
In this case, circuit solutions can be made using a similar approach to
dc analysis, but using complex numbers instead of real numbers.
This is of course somewhat more difficult than dc analysis, but it
is a great deal easier than working with high-order differential equations
for a circuit with several inductors and capacitors!
The ac situation is of great practical importance. Most electric
power systems work with approximately sinusoidal time-functions.
Communication systems too have traditionally depended on modulation of
sinusoids to convey information. Other waveforms can also be studied
as a mixture of different sinusoids.
The exam has three Sections: A, B, and C.
Assessment (required work)
This year, for new students the following is valid,
for passing the three `Ladokmoment' that make up the full
7.5p course.
To pass PRO1: Homework.
-
There is a homework task corresponding to each Topic from 2--13,
i.e. for every lecture+tutorial except the first and last.
Submitted solutions do not have to be perfectly correct, as long
as they show a "sincere attempt"!
-
Homeworks will be submitted by emailing scans or photographs.
In some cases, equations or numbers in plain text in the email
might be requested. The exact details will be given within each
homework task.
-
A proportion of homeworks (half of them: any 6) must be approved
in order to pass PRO1.
-
Some exam bonus points are given, in proportion to the
number of approved homeworks that were submitted before their
deadlines. This bonus is added to the total exam score
before setting the grade.
The bonus is directly proportional to the number
of approved homeworks: at the most (for 12 in-time approved
homeworks) the bonus is 4% of the exam points, which is nearly
half a grade-boundary.
The exact calculation of exam grades can be seen at the top of last year's
exam, 2015-03_EM_tenta.pdf.
The bonus can thus affect even the pass/fail decision, but it
cannot help if you get below the minimum for a particular section
of the exam (40% for A and B, 30% for C); it only helps to change
the total score, for which 50% is the pass level.
To pass PRO2: Lab tasks.
-
There are three obligatory laboratory tasks, and one
optional task at the end.
The aim is to get some experience with concepts and measurements,
including familiarity with common instruments.
-
Active participation in the lab session is
all that is required. Careful reading of the notes beforehand,
and of the `solutions' afterwards, is of course advised
in order to get the most benefit from the lab work.
For each of the three lab tasks there will be four sessions
provided, with up to 20 people at each.
To pass TEN1: Written Examination (optionally including Kontrollskrivningar)
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The exam will be structured with the same "cumulative" nature as
it had during VT14 and VT15.
That seemed very popular, for spreading the load
of the course, reducing stress, and giving a second chance.
See the instructions on the
2015-03_EM exam for
a better understanding of the Sections in the exam, and the way that
KS1 results can be included.
-
You do not need to attend the mini-exams KS1 or KS2.
However, KS1 fully covers Section A of the course, and KS2 fully
covers Section B. So if you get a good grade in a KS, you can use
this in the exam, and avoid writing one Section there.
See the "Course Structure" paragraphs, above, for more detail.
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If you have already passed Sections A and B due to your KS grades,
then you don't need to answer these part in the final exam in March,
but can instead focus on just Section C.
Or you can try to improve your grade by answering A and/or B in
the final exam (after completing Section C).
If you have not already passed Section A or B, you can take another
chance in this Part 2 exam.
(You will probably find that the system is more simple in practice
than it might sound from the above!)
-
The results from a KS can only be used to replace Exam sections from
the same course-round. For example, results from KS1 or KS2 taken in VT15
can be used within the exam in March 2016, or the re-exam in June 2016,
but cannot be transferred to later years.
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The re-exam is treated an alternative to the main exam.
In the re-exam you can use the better score out of e.g. KS2
and the re-exams's Section B. But you can't
take e.g. Section B from the main exam to replace a poorly
written Section B in the re-exam.
If you've taken both exams, you can keep the result from whichever
one gave you the better result (this is mainly relevant to anyone
who tries to improve their grade, after already passing in the
first exam).
If you are re-registering from a previous year and have
not already passed PRO1 or PRO2, then you should do the homeworks
and labs (same conditions as the new students). If lab times are
a great trouble due to a job or other course, we may consider
alternative work.