Ohm's Law
Ohm's Law,discovered by a German physicist Simon
Ohm (1787-1854),
Is an important law that describes the
relationship of voltage E to current I and resistance R.it is often referred to
as the foundation of circuit analysis and can be expressed by three different
ways:
I=E/R,
E=I R or R=E/I
Where
E= the potential difference from one end of a
resistance element to the other ,in volts.
I=the current through the same resistance
element,in amperes.
R=the resistance of
the same element,in ohms.
I = E/R
E
I = 3 v / 1000 Ω
= 3 mA
I = 6 v / 1000 Ω
= 6 mA
I = 9 v / 1000 Ω
= 0.009 A
= 9 mA
I = 12 v / 1000 Ω
= 12 mA
I = 15 v / 1000 Ω
= 15 mA
for any circuit the electric current is directly proportional to the voltage and is inversely proportional to the resistance.
كلما زاد الجهد أو قلت المقاومة كلما زاد التيار المتدفق .. و زيادة المقاومة تحد من مرور التيار كما هو واضح في قانون اوم
