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  Forward Bias
If we reverse the polarity of the battery, both the electrons and the holes will move towards the P-N junction. When the electrons are in such a close vicinity to the holes they will be able to jump into the holes. The movement of the electrons will enable the flow of the current in the circuit and the lamp will shine on our little friend. You could think of this polarity change as if the current changed to the opposite direction compared to the reversed biased diode. In this circuit, where the positive pole is placed versus the p-type area, the current will flow through the diode and the diode is said to be forward biased.
 
     
 
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MLA style: "The Transistor". Nobelprize.org. Nobel Media AB 2014. Web. 22 Oct 2014. <http://www.nobelprize.org/educational/physics/transistor/function/forward.html>

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