### Author Topic: Ohm's Law  (Read 1594 times)

0 Members and 1 Guest are viewing this topic.

#### rahulpwns

• Jr. Member
• Posts: 28
##### Ohm's Law
« on: November 19, 2011, 08:07:53 PM »
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

• Supreme Robot
• Posts: 4,672
##### Re: Ohm's Law
« Reply #1 on: November 19, 2011, 08:51:05 PM »
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
Regards,
Søren

A rather fast and fairly heavy robot with quite large wheels needs what? A lot of power?
Engineering is based on numbers - not adjectives

#### Gertlex

• Supreme Robot
• Posts: 763
• Nuclear Engineer · Roboticist
##### Re: Ohm's Law
« Reply #2 on: November 19, 2011, 08:51:39 PM »
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...
I

#### rahulpwns

• Jr. Member
• Posts: 28
##### Re: Ohm's Law
« Reply #3 on: November 19, 2011, 11:53:13 PM »
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

• Expert Roboticist
• Supreme Robot
• Posts: 335