obso

Member Since: November 10, 2008

Country: United States

  • News - Kill A Watt | about 5 years ago

    “But how does it actually measure current? I’ve wondered whether those things have a hall effect sensor, or they just measure the voltage across a small (<1ohm) high power resistor."
    The latter. The big loop of wire you see in the white box just to the left of the receptacle plug in the 3rd picture looks to be what they are using for a shunt.

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