EE2010 Fundamentals of Electric Circuits

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Presentation transcript:

EE2010 Fundamentals of Electric Circuits Lecture 3 Basic laws of circuit theory: Ohm's law, Kirchoff's laws.

Developed in 1827 by Georg Simon Ohm Ohm’s Law Developed in 1827 by Georg Simon Ohm Ohm’s Law explains the relationship between voltage (V or E), current (I) and resistance (R). The current (I) flowing in a conductor is directly proportional to the applied voltage (V) and inversely proportional to its resistance (R) V = IR I = V/R R = V/I

Ohm's law magic triangle 3

Example:a calculate the amount of current (I) in a circuit, given values of voltage (E) and resistance (R): 4

Example:b calculate the amount of resistance (R) in a circuit, given values of voltage (E) and current (I): 5

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Ohm’s Law in Graphical Form Linear relationship between current and voltage y = mx y is the current x is the voltage m is the slope

Ohm’s Law in Graphical Form 9 6

Ohm’s Law

Ohm’s Law Example : Calculate the unknown quantities in the following circuit.