I am new to circuits/electrical stuff
Correct me if i am wrong.
if i have an led (2.1V / 0.02A) and if i give it 0.02A it will only take 2.1V or if i give it 2.1V it will take 0.02A
Ohms law (\$I=\frac{V}{R}\$).
If start with 9V i can use ohms law to get the correct power for the led because i know how many amps it requires
My question is:
If i started with 9V. Could i drop the voltage down for a component that takes 5V without knowing how many amps it uses?
Sub-question:
Wouldn't a circuit like this drain a battery or cause the circuit to short out?