Re: LEDs – Expanding Batteries – CR2032 to 2 C or D size

Home Evil Mad Scientist Forums Ask an Evil Mad Scientist LEDs – Expanding Batteries – CR2032 to 2 C or D size Re: LEDs – Expanding Batteries – CR2032 to 2 C or D size

#21805
Windell Oskay
Keymaster

You do need to use the V= I * R formula, in almost all cases.   The exception– the only case where you do not –is when the forward voltage of the LED is greater than the voltage source you are providing (for example, a blue or white LED driven from 3 V).

Also, an LR44 is a 1.5 V alkaline cell.  Three C cells can replace three LR44s.