measurement

Discussion in 'General Electronics Chat' started by Robert123, Mar 21, 2010.

  1. Robert123

    Thread Starter New Member

    Feb 12, 2010
    29
    0
    measurement
     
    Last edited: May 11, 2010
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    One easy way to measure current is to use a fixed resistance in series with the load, and measure the voltage across the fixed-value resistor.

    Ohm's Law says:
    E=IxR, or Voltage = Current time Resistance.
    Similarily,
    I=E/R, or Current = Voltage/Resistance.

    So if you have a resistor that measures exactly 1 Ohm, you can read the current flowing through the resistor by measuring the voltage drop across the resistor. In the case of a 1 Ohm resistor, 1V drop = 1A current.

    You can scale the resistance down if desired. If you use a 0.1 Ohm resistor, then a 1 Volt drop = 10 Amperes current through the resistor.
     
    PackratKing likes this.
  3. Von

    Active Member

    Oct 29, 2008
    65
    0
    A current transformer is another alternative.

    It is a ring device and requires that the conductor pass throught the center.

    No voltage drop or other issues with inserting a device in series.
     
  4. Mike33

    AAC Fanatic!

    Feb 4, 2005
    349
    25
Loading...