how to work out R T V ohm law

Discussion in 'Homework Help' started by waheedrafiq, Jan 7, 2004.

  1. waheedrafiq

    Thread Starter New Member

    Jan 7, 2004
    1
    0
    guy's firstly I like to say this site needs to be more adversite i simplly couldn't find it in when i type in circutirs fourms not a lot came up from google.


    my problem is that i just can't get the maths around my head with the Ohm's law is there anyone who can explain to me how to work out R if the value was example 10K and the volt was 5V then what is the I and how do you work this out can i have step by step example please.
     
  2. Davis

    Member

    Jan 5, 2004
    13
    0
    Well you know this
    R = 10k
    V = 5V
    I = ?

    and I'm pretty sure your circuit looks like this

    +5V
    |
    |
    |
    \
    / 10K ohms of resistance
    \
    /
    |
    |
    |
    Ground

    You know 5 volts is droped across the entire 10k ohm resistor (10,000 ohms)
    Therefore you use ohms law V=I*R where V = voltage in volts, I = current in amps, R = resistance in ohms.

    So you can take 5V = I * 10,000ohms
    5volts/10,000ohms = I in amps = 0.0005 Amps or 0.5milliamps

    Best of luck,

    Matt
     
  3. Battousai

    Senior Member

    Nov 14, 2003
    141
    44
    The current on a wire flowing from points A to B (Iab) is given by:

    Iab = Vab/R

    where Vab = Va - Vb, Va is the voltage at point A, Vb is the voltage at point B.
     
  4. Dave

    Retired Moderator

    Nov 17, 2003
    6,960
    143
    A good way to remember Ohm's Law is the triangle method:

    Voltage
    ---------
    Current | Resistance

    I.e:
    Voltage = Current x Resistance
    Current = Voltage / Resistance
    Resistance = Voltage / Current
     
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