#### jptsunil

##### Newbie level 2

Please Help Me ............

Resistor of which value should be place at R1

to achieve 3v and 20mA for LED

and what will be the values of current , volatage and resistance

across each component

I am trying to understand Resistors

since last 15 days but failed badly

Please Explain in Detail

and formula to calculate this problem

i have tried on many website to understand but

- some says resistor resist current

- some says it resist voltage

- some says it resist current and drops voltage

I am in Huge Confussion if any of the above is true

then how its true and how can i calculate it