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V=IR

I=V/R


Shunt Resistor:

  • needs to be small such that it does not disrupt existing circuit.
  • large enough to get a measurable voltage


Be careful about power rating.

P=I2R 

p=102 x 10Ω

= 1000w


Example Shunt for 12V :

Max Amp50A
R10 Ω
I = V(measured)/R8v/10 = 0.8A
P=I2R 

=502 x 10Ω

=250 kw


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