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Summary:
 Help with a wattmeter for 220V circuits that have only resistors.
Hello guys!
I'm just a begginer student. I found this circuit of a wattmeter that works only with resistors. Can someone explain to me how the 33k resistor give a voltage of 1 mV to 1 Watt? I did not understand why these resistor values has been chosen and why the it measures only in the 33k resistor.
Link: https://everycircuit.com/circuit/5290189996163072/simplewattmeterfor220voltcircuit
I made a version (only changing one resistor value) at Fasltad: http://tinyurl.com/y7uqu8n4 (the url was too big).
Can someone help me? Thank you!
I'm just a begginer student. I found this circuit of a wattmeter that works only with resistors. Can someone explain to me how the 33k resistor give a voltage of 1 mV to 1 Watt? I did not understand why these resistor values has been chosen and why the it measures only in the 33k resistor.
Link: https://everycircuit.com/circuit/5290189996163072/simplewattmeterfor220voltcircuit
I made a version (only changing one resistor value) at Fasltad: http://tinyurl.com/y7uqu8n4 (the url was too big).
Can someone help me? Thank you!
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