limit current and avoid having it explode
To calculate the current through an LED, use the following formula Current = (Source_voltage - Led_voltage_drop)/Resistance Now if you didn't use a resistor, the you only have the resistance in the wire, which is very small (eg .001 ohm). So if you have for instance a 9V battery, and a 2.1 volt drop across the LED, the resultant current would be so high, it would destroy the LED. We put a resistor in to lower the current to an acceptable range (often 20-30ma)
In series with the LED. The value would be whatever it takes to obtain the required voltage and current across the LED. As an example, if you had an LED that required 25ma at 2v, and you wanted to use a 9v battery, you would need a resistance of 280 ohms. (This is (9-2) / 0.025, a simple application of Ohm's law.)
Resistance is resistance , no matter if it is contact resistance or any other resistance. And formula is R = V / I.
On Circuit Resistance = Close to the total load Resistance. Off Circuit Resistance = Near Infinitive High Resistance.
The massive resistance was a policy to unite white politicians and leaders in Virginia to prevent public school desegration. It was led by U.S. Senator Harry F. Byrd, Sr. of Virginia.
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Passive subsistence.
the purpose of it is it integrates schools
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The act of crop dusting itself has not led to pesticide resistance. Mismanagement of pesticide application is the root cause of pesticide resistance.
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because it is resistant to the led lights and Mercury
He led the two resistance movements against Canadian government and Sir John A. Macdonald.
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