Wattmeters - what's inside, how do they work

Exploring the mysterious internals of analog wattmeters, explaining their purpose, how to use them and how do they work. What's a real AC power in Watts, apparent power in VA, reactive power (inductive and capacitive), power factor and current phase shift. Briefly talking about digital wattmeters and showing my DIY "digital" wattmeter, with schematic and how does it work.
Power factor meters:
• Power factor meters - ...
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