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Ohm’s Law

RELATIONSHIP BETWEEN VOLTAGE, CURRENT, AND RESISTANCE

The three aforementioned quantities are related in the following equation (Ohm’s Law):

 Voltage  = Current times Resistance

                              or

                        V = IR

 Whereupon  V = Voltage; I = Current; and R = Resistance

 Simple Circuit Example:

 

 

In the above circuit when the Toggle Switch is open as shown, the 12 volt lamp cannot light and the battery cannot put out any current because there is an infinite resistance to Electrical current flow (open circuit). 

Applying the formula: V=IR or R=V/I 

R= +12v /0 current gives us an Infinite value for Resistance in ohms = Open Circuit

When the Toggle Switch is closed, the Lamp presents a finite resistance to electron flow, but because the lamp contains a filament, the filament will begin to glow as current passes through it.

If you wish to acquire a better understanding of Electronics Theory, I suggest you go to  the following  link: Electronics

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