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The Kill A Watt (a pun on kilowatt) is an electricity usage monitor manufactured by Prodigit Electronics and sold by P3 International. It measures the energy used by devices plugged directly into the meter, as opposed to in-home energy use displays , which display the energy used by an entire household.
Essentially, the meter's shunt resistor, used to generate a voltage proportional to load current, is replaced by one of value typically 100 times larger, with protective diodes. Readings of the modified meter have to be multiplied by the resistance factor (e.g. 100), and maximum measurable power is reduced by the same factor.
A home energy monitor is a device that provides information about a personal electrical energy usage to a consumer of electricity. Devices may display the amount of electricity used, plus the cost of energy used and estimates of greenhouse gas emissions .
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In May 2009, Google announced that it had partners with smart meter maker Itron. [5] In October 2009 Google PowerMeter announced their first "device partner", The Energy Detective (TED 5000), an energy monitor from Energy Inc then only available only in North America, [ 6 ] and their first UK partnership which was with AlertMe .
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