1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Calculate the current being drawn from a battery

  1. Jan 1, 2004 #1


    User Avatar

    If I have a question asking to calculate the current being drawn from a battery can I, or rather should I, give an answer in Ohms?

    I hate electricity...

    Thanks and a Happy New Year to you all.

  2. jcsd
  3. Jan 1, 2004 #2
    Resistance is measured in ohms. Current is measured in amps.
  4. Jan 1, 2004 #3


    User Avatar

    Hi Jim

    Thanks, the penny is dropping...

    I have been given the voltage and the resistances

    So I guess I can work out the total resistance and then use P = V^2/R

    and from there P = V/I > I = V/P

    Just thinking aloud but I would be grateful if you could confirm that I am on the right track.


  5. Jan 1, 2004 #4
    Wouldn't it be easier to use Ohm's Law?

  6. Jan 1, 2004 #5


    User Avatar

    Thanks Doug

    "What's that?", you probably heard me say...

    Yes, I got it, thanks very much.

  7. Jan 2, 2004 #6

    Actually, E is more commonly used to symbolize voltage. The unit of measure for voltage(E) is the Volt(V). E = 10V for example. Anyway,

    [tex] P = E I [/tex]

    So to calculate the current with a given Voltage and Power:

    [tex] I = \frac{P}{E} [/tex]

    You could save yourself a step and use

    [tex] I = \frac{E}{R} [/tex]
    Last edited: Jan 2, 2004
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Calculate the current being drawn from a battery