Electrical Circuits Scan From Textbook
Electrical Circuits Scan From Textbook
 Created by: Nadeem P
 Created on: 291209 14:26
First 401 words of the document:
52
Vl graphs show how lhe currenl varies as Uou change the voltage. Learn lhese lhree real well:
Differcnt Resistorq Filament Lamp
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The cumeni through a resistor (at constanl As the ie_rnperature of Current will onlg flow
lernperature) is proportlonal to voltage. the filarnent incrpases, through a diode in one
Different resis_lors have different the resistance increas.es, dlreclion, ds shown.
resistances, hence lhe different slopqs. hence the curve.
R = "I./ara
For.the srrarghfllnggtaphs lhe resislance of lhe componenl is sleadg and is equal to lhe inverse
of the gradienl of the line, or "l/gradient". tn olher words, rhe steepir the grap'h ihe lorryen rtre
resistance.
lf the gtaph curves, il rneans lhe resislance is changing. tn that case R can be found for ang
point bg taking lhe pair of values (V l) from the graph and sticking them in the formula V '.
R=
Easg.
EXAMPLE. Voltrnefer V reads G V and resistor R is
4 Q. what is lhe current lhrough Arnrne ter A?
ANSWER. Use lhe forrnula V = I x R.
we need to find l, so the version we need is

 v/R.
The answer is then: 6/4 which is l.S A.
In ,the end you'Il have to learn this resistanii ii furiiie.,."
You have lo be able lo inlerprel volfagecurrenl graphs for gour exam. Rernember
qlope, lhe lower lhe resisfance. And gou need lo know thai equation inside oul,
 the sleeper lhe

back to fror*Gside
down and in swahili. eqyqlion in electiics, bar none. (p8. r mighr rer
*tT"S:no*9J"!.nAg1tff ofrrhe swahiri.) sou
Phusics 2(ii) Electriaifv nnrf fhe Afnryt
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