Here’s one. A simple home wiring circuit. One kerosene lamp with a 60 watt bulb adjectives new stuff zilch abnormal. 120 volts running a 60 watt bulb should verbs .5 Amps. ( I ) = P(60) / E(120) so I=.5 right? So since resistance is figured by R = E / I consequently the resistance of the bulb should be 240 ohms. 240 = 120 / .5 right? Even if you don’t use, I , then R = E square / P . 14400/60=240 right? This speak that the bulb is not labeled and you want to know what size to replace it with. Take a meter and method the resistance of a standard 60 watt bulb. Average is 18.5 ohms I did it with 3 different type bulbs and two different meters By Ohms regulation P=E square / R so 14400/18.5 =778.37 so if all you know was the resistance of the bulb and the voltage available would you be in motion out and buy 778 watt replacement?
Answers:
Be very guarded. Ohm's Law refers to DC power. Light bulbs are used in AC power applications contained by which the voltage constantly changes from -60v thru 0v up to +60v and stern.
DC voltage can only be determined after rectify and filtering and will be 65% of one cycle of AC. One cycle is 60v, 65% is 39v. Filtering uses reactive components, requiring trigonometry to divide, which reduces actual voltage even further. So eventually you end up near 34v in DC rank.
Like you said, E squared over R ( 1156/18.5) gives 62 watts. AC power is a undamaged nother study on top of DC electricity. Cosines, vector arithmetic, power factor, etc.
http://www.allaboutcircuits.com/vol_2/ch...
Oh sure I would........... what ever you say........
778 watts, um no, hi powered spots are usually singular 300 watts rated. You are not checking the proper resistance, you have need of to check for load resistance not past its sell-by date power resistance. Most bulb replacements should be at the rating for the fixture as well as own the same underpinning size.
The answers post by the user, for information only, CeQnA.com does not guarantee the right.
Related Questions :
Does anyone know what the frequency within mHz of a Realistic TRC-427?
How loud is 120 Dessa bells?
I want to hook up my latest dvd player and i don't which slot to put the red,white and washed out plugs into.?
Is it possible to transmutation a addressee component into a transmitter?
How do you capture the extremity bit of a 1/4" phone jack out of 1/4" socket? I pulled it out but the conclusion stayed contained by.
When does the clock draw from set put a bet on 1 hour? SAT. NIGHT OR SUNDAY?
Bluetooth that will work next to phone and PS3?
What are the probability of GAME giving me an exchange of my imperfect ps3?If you finger slips when handling a CD/DVD?
Why does Sony release a DVD-player near same specs at a cheaper price? Is it equal feature or not?