Chapter 1 : Elec. Energy Conversion
1- Introduction .
2- Meaning ofenergy .
3- Forms of energy.
4- Energy resources.
5- Conventionalmethods for elec. Energy conversion .
6- Alternativemethod of elec. Energy conversion .
Qu. 1 : write down the advantages ofelec. Energy ?
Sol : The main advantages are
1- electrical formcan be transmitted .
2- the electricalenergy easy utilization .
3- if more easilycontrolled .
الطاقة :- القدرة على بذل الشغل .
Qu 2 : definition
of energy
Is the ability to
do work .
Qu 3 : The
petroleum stokes can last only about 50 year and so its now to look for
substance to generate electrical energy instead of the petroleum .
- write down some of the importance steps in thisdirection ?
S
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الصورة العامة - y' = F(x,y)
or
M(x,y)dx + N(x,y)dy = 0
1- Separable equations :
ويتم فيها فصل x عن y (فصل المتغيرات)
to solve the separable equation :
1. set y' = dy/dx
dy/dx = f(x)g(y)
2. dy/g(y) = f(x)dx
3. by integration we obtain the solution .
:: Special case ::
- If the DE in the form y' = F ( ax + by + c )
to solve this equation we set [ ax + by + c = z ]
2- Homogeneous equations :
F(x,y) is called homogeneous of degree if F( tx, ty ) = tn F(x,y)
إذا كان كل حد من حدود المعادلة من نفس الدرجة تبقى homogeneous
or x/y or y/x
a DE M(x,y)dx + N(x,y)dy = 0
is called homogeneous if M(x,y) & N(x,y) are hom
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Differential Equations
divided two branches :
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