Watt meter concept?

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Discussion in 'General Electronics Chat' started by twister, Apr 26, 2009.

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  1. Apr 26, 2009 #1
    twister

    Thread Starter Member

    Mar 31, 2009
    15
    0
    Well, for measuring DC watt, basically we use a shunt resistor. Current go through this shunt resistor and develop a tiny voltage drop and amplified by the op-amp. But, how the amplified voltage value is used to measure the power across the load? Thanks.
     
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  2. Apr 26, 2009 #2
    thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    We multiply the value representing current by the applied circuit voltage.:)
     
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  3. Apr 26, 2009 #3
    twister

    Thread Starter Member

    Mar 31, 2009
    15
    0
    am i correct:
    value representing current = current across shunt.
    applied circuit voltage = voltage across the load?
     
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  4. Apr 26, 2009 #4
    b.shahvir

    Active Member

    Jan 6, 2009
    444
    0
    Actually, value representing current = current thru shunt (load current), current thru meter proportional to voltage drop across shunt but calliberated to record load current!


    You are correct!
     
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