Friday, April 18, 2008

OHM'S LAW

Ohm's Law merupakan rujukan asas kepada kejuruteraan elektronik.

Ohm's law applies to electrical circuits; it states that,At constant temperature the current passing through a conductor between two points is directly proportional to the potential difference (i.e. voltage drop or voltage) across the two points, and inversely proportional to the resistance between them.
The mathematical equation that describes this relationship is:


V=I X R


Where I is the current in Amperes, V is the potential difference between two points of interest in volts, and R is a circuit parameter, measured in ohms (which is equivalent to volts per ampere), and is called the resistance.

Equation above is for DC circuits where there is no AC Transient appears in the circuits.

For circuits that have AC Trancient and RF properties such equation is unsuitable which complex impedance is to be take into account at the designing stages.


V=I X Z


Where Z is the complex impedance of the AC Transient properties.

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