This is a summery of electrical circuits, in the context of engineering. It covers first year work and includes:
-voltage, current, resistance
-power
-ideal sources (independent and dependent)
-Ohm, Kirchhoff current and voltage law
-resistance, current, voltage in parallel and in series
-d...
voltage t resistance
energy perunitcharge rate of flow ofcharge material that resist
flow of charge
sign convention
voltage drop the enter positive polarity
voltage nse ve enter negative polarity
POWER P V2 R
d absorbed
power re power ve
p v i p ie r power of voltmetersampmeters power of resistors
independent
IDEAL SOURCES not rely onother
sources I v f i
voltage
maintain voltageacross
terminals despite current dependent
current rely on other sources
maintaincurrentacross requireconstrainteqn I v n i
terminals despitevoltage P
is fly 115
KIRCHHOFF CURRENT KIRCHHOFF VOLTAG
OHM LAW LAW LAW
sum of all currents at any sum of all voltages at an
v iR node is equal to 0 closedpathisequal to o
voltage rise rember passive gig rember passive sig
convention
voltage drop convention
,CASE ONE CASE TWO
resistor in series he resisters in parallel
a
Reg Rit rat É y
Rs
peg rt at g t.br
3143133
CASE THREE case FOR
current voltage
in series onparallel o in senes in parallel
constant different different constant
in Reg ienteringil ve feta vacrosssenes
Req Rt the Reg Rit Rz Rs
i currentthrough R V voltage acrossR
smaller R greater i greater R greater
CASE FIVE CASE SIX
Wheatstone bridge delta to wye
measure resistors or a range
FMR r3t Roc Rs
tu
is13h3 Big
in Rx
iz Rz
D Y
to
I D
,NOPE VOLTAGE METHOD
more than 2 elements
1identify essentialnodes attached
2 identify reference node
assign it a voltage o
3 sum all currents in voltage and voltages
resistor form
using simultaneous
ie whole current
tmEiaieiijaneacneans wwentpawafPlY
CASE ONE CASE TWO
uh t resistor between
I two ness
f
voltmeter directly
c
between a ness node
and niet I Vi Vi v2
voltage of ness is
that voltmeter node
reading V2 tui
R
CASETHREE CASE 4
me I supernode
I Ivi t I V2
I
i
when there a independent dependent
resistor between ness voltage voltmeter between 2 ness
and other voltage
treat as one node Korean and sum
vi Ctv tri CV all currents going in B out of both
n nodes
create a consort ean
include dependent constr
ears tvi Va V
solve simultaneously
, MESHCURRENTMETHOD substitute always
always before resister
1
identify mesh's
2 include current directions in mesh G D
3 create KUL ears for each mesh
2 solve simultaneously
CASE CNE CASE TWO
EEE ti Ji n i
shared resistor between 2 currents
ampmeter in mesh unattached to any other
assign t signs on bom mesh
meshes but opposite sides over i assigned i
R recon direction
mesh mesh ftpge
Rcti id pg
CASE THREE
sharing a ampmeter between 2 meshes
g g g treat as one singular mesh
i
include a constr
eqn iz i
k
bc i go in opposite
direction to i ve
include dependent constr ears
solve simultaneously
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through EFT, credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying this summary from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Ghitae. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy this summary for R160,00. You're not tied to anything after your purchase.
