Ohm's Law

[rahulpwns]

hey,
i need help with calculating the amount of ohms my resistors need to be with ohm's law.
i have a sensor that has an Operating voltage of 5v and a max current of 25mA.
would i do 5v/.025A?

-rahulpwns

[Soeren]

hey,
i need help with calculating the amount of ohms my resistors need to be with ohm's law.
i have a sensor that has an Operating voltage of 5v and a max current of 25mA.
would i do 5v/.025A?

-rahulpwns

Since you don't like using Google to get your answers, let us do your footwork and direct you towards this calculator combining Ohms Law and Watts Law

[Gertlex]

That would indeed give you a value of Ohms, but the rest of us have no idea what sensor you're using, and therefor whether what you're doing makes sense...

[rahulpwns]

sorry if i came across as too vague.
@soren i have been researching the formula, but i have not come across a site which has helped me understand what values of current to use.
here is the link to the sensor:
http://www.pololu.com/catalog/product/959

[bens]

Hello.

That sensor already has a current-limiting resistor for the IR LED built-in.  You do not need an external resistor to use it.

- Ben