Can you guess the reason why the ratio of v and I in case of LED is not constant?
Answers
Answer:
As per ohms law voltage/current=constant.
so, when the resistance changes, the ratio of the voltage across the resistor and the current passing through it will not be a constant.
Answer:
This is due to forward voltage and maximum continuous current rating characters of LEDs.
Explanation:
The high voltages create heat removing a resistor from its ohmic region. The light bulb is non-ohmic because the filament burns at high temperatures. LEDs are non-ohmic because they are semiconductors. The heat provided by the copper attachment wires heat up the LED leads.
Constant temperature makes the resistivity constant which made resistance constant. Constant resistance again made the Ohms law applicable. That's why Ohms law is applied only at constant temperature. It is like the conditions apply of the law.
Neither the incandescent bulb nor the LED will follow Ohm's Law, neither produces a linear graph.
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