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Assume you have an LED that requires 5V to turn on. Explain how contact potentials within...

Assume you have an LED that requires 5V to turn on. Explain how contact potentials within the circuit will affect the value of the voltage source? Will the source need to greater than or less than the 5V needed for the LED? Ignore all other topics such as resistance and only focus on contact potentials for this question.

engineering   Electrical-Engineering   
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Answer #1

**Contact potential depends upon the work function of the materials involved in making circuit like P type and N type semiconductors are joined together to form PN junction .

**Contact potential =

Difference in potential of P and N regions of LED diode

**So , it is already present in the LED and has no role or relation with magnitude of supply voltage that is required to turn on the LED

so , contact potential will not effect source voltage

and 5V is enough to light up the LED

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