Do I need to measure current while bulb is operational in order to use Ohms law P/I squared= ohms?
If t is temperature then the ratio must be z(t). :grin::grin::grin:Forget the Ohmmeter. Just measure the lamp current and applied voltage, then divide V by I. Be aware though that this resistance changes drastically with temperature.
If t is temperature then the ratio must be z(t). :grin::grin::grin:
Isn't z(t) a kind of pasta?If t is temperature then the ratio must be z(t). :grin::grin::grin:
... Just measure the lamp current and applied voltage, then divide V by I. ...
Yes, that's true. However, but considering most fillaments are coiled and there would be a phase shift between voltage and current I'm certain there will be some arguing that the impedance goes to infinity during part of the cycle. :roll:If t is temperature then the ratio must be z(t). :grin::grin::grin:
Well no, the ratio v/i will go to infinity if there is any phase shift at all, but Z is a constant and would not change.Yes, that's true. However, but considering most fillaments are coiled and there would be a phase shift between voltage and current I'm certain there will be some arguing that the impedance goes to infinity during part of the cycle. :roll:
cf
Testing 120V halogen 50 watt bulb ...
Ballast?Theory is just that, theory. If you measure the voltage and current at the fixture input, it will be much higher than 50 watts. Reason is you are assuming 100% efficiency, and neglecting the ballast consumes power in addition to the lamp.
Those halogen ballasts are hard to find. :grin:Ballast?
efficiency?
cf
Those halogen ballasts are hard to find. :grin:
Sorry bout that, for some reason I had HID lighting in mind. Bad day.Ballast?
efficiency?
cf
I knew that. Hopefully it was just a mild, good-natured tease.Sorry bout that, for some reason I had HID lighting in mind. Bad day.