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EE2311 BlockA Unit 1 V I R (Concept (Types (source (Ideal Current source…
EE2311 BlockA Unit 1 V I R
Voltage
Kirchhoff’s Voltage Law
1.start from some point in a loop
make a closed loop
if +in - out, mark the positive voltage, vice versa
a closed loop sum of voltage should be 0
all kind of loop must be repeat 1-4 step
In fact, voltage RISE when - in + out and vice versa (eletron direction)
Power is pumped by source, vice versa
Current
Kirchhoff’s Current Law
no current create or destroy
must in closed loop
sum in a node must be 0
enter use addition , leaving use minus
i1(in) - i2(out)+i3(in)= 0
Ik can be negative
Resistant
Ohm’s Law
V=IR
P=IV
P=(I^2)V
P=(V^2)/R
genered Power equals to Comsumed Power
Concept
Current Direction: +=>-
Electron diction: - => +
Must in loops
Types
Branchs
a path conned by two terminal points
Node
Junction of two or more branchs
Loop
any closed connection of branches
Mesh
A loop that not contain any subloop
Loads
components that comsume power
eg: resistors
source
Provide power
Ideal Current source
Voltage can change for loads current unchagne
symbol: +- V
Ideal Voltage source
Current can chagne for loads voltage unchagne
symbol: a arrow
Short circuit
no load, all current through this path
V=0, I = current source's current
Open circuit
no curent, V = Voltage source's voltage
Structure
Parallel Network
總電阻的倒數=分支電阻倒數之和
分支電流=總電阻x總電流/分支電阻
分支電壓不變
Series Network
總電阻=各電阻之和
分支電壓=分支電阻*總電壓/總電阻
分支電流不變
Ammeter and Voltmeter
Amm
series network
Vol
Parallel network
sel resistants will affect the voltage(look like a series network with a resis)