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Re: Jule Thief
I=V/R : Amps = Voltage / Resistance
A small battery (AA, A,C,D cells) can push over 1.0 amps. An LED or transistor often can't handle 1.0 amp. (check the rating on the package) So you can either: reduce voltage or increase resistance to lower your amps and protect your component. Increasing resistance by adding a resistor is easier (and usually more efficient) than reducing voltage. Your resistor value will be determined by your voltage and how many amps you can safely draw using the I=V/R equation. Resistors are in fact lossy components, but the losses are minuscule in low-power operations and required to keep your other components from frying.
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