FUNDAMENTAL LAW

2.1 OHM’S LAWS

—Ohm's law is the main basic electrical law and defines the resistance of a device to the flow of electrons.—The voltage across a resistor is directly proportional to the current through it.

                           V α I

                            

—The constant of proportionality is called Resistance measured in ohms (W).

                             

I = the circuit current (A)

V = the applied voltage (V)

R  = the resistance (W )

                        

—The resistance R of an element denotes its ability to resist the flow of electric current. It is measured in ohms (W).—To apply Ohm’s Law:  1. Be careful to the current direction and voltage polarity.  2. The direction of I and the polarity of Voltage, v must   conform with the passive sign convention.

Ohm’s Law Equation

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