Questions tagged [wattmeter]
6 questions
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How to determine resistors for rectifier bridge wattmeter - Hewlett patent 3662264
More than 40 years ago I worked for a company that sold, modified, and serviced a wide range of electronic instruments, including wattmeters. In particular, we built watt transducers that used a core circuit comprised of just resistors, rectifiers,…
PStechPaul
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Watt meter and load
I have recently purchased a watt meter from Adafruit to measure the cumulative watthours of a non-constant (DC) current.
When I use a multimeter to test the voltage and amperage, I get what I expect: 12 V, 1 A. When I use the wattage meter, I get 12…
BEn
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Is the "two-wattmeter" method enough to measure active power into a BLDC motor?
I have a 4-channel scope, 2 current clamps (to measure \$i_2\$ and \$i_3\$) as well as 2 voltage probes (to measure line voltages \$v_2-v_1\$ and \$v_3-v_1\$ according to the aforementioned formula). In the scope I can use math mode to multiply…
Je parle avec toi
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2 wattmeter method for measurement of power in 3 phase AC circuits
Could someone please explain the concept of the lagging and leading pf in 3 phase AC circuits with respect to these special conditions
Arinjoy Pramanik
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Best way to measure watts usage from an 110V 2000W electric heater
I want to measure how much watts does my electric heater uses. It says it is a 2000W heater on a 110V outlet. I tried the kill-a-watt meter but that only goes max of 700W. What are some solutions to this?
Patoshi パトシ
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Is the two-wattmeter method applicable for an unbalanced source?
In balanced three-phase systems we can use the two-wattmeter method to measure total power. What about unbalanced sources and/or balanced/unbalanced loads? Can we use it for both delta and wye connections?
Nakib
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