Example; a 40 watts flourescent lamp what would be the ampere @ 220 volts supply
2006-10-22 19:07:32 · 2 answers · asked by scram!!!! 1 in Science & Mathematics ➔ Engineering
Previous is correct other than that a fluorescent lamp is connected to a choke. Therefore there is PF to be taken into consideration.
Generally, a fluorescent choke has a PF of .8 (nominal) therefore the above answer has to be divided by .8 to get the VA of the circuit.
Answer .2275A.
2006-10-23 09:38:52 · answer #1 · answered by Barrie66 2 · 0⤊ 0⤋
Well, to solve your example, you could use the following equation:
P=I*V
P=power (in Watts, W)
I= current (in Amperes, A)
V=voltage drop across element (in Volts, V)
For a 40W light bulb at 220V supply, the current is .182A.
Or....
Another important equation is Ohm's Law.
V=I*R
V and I same as above
R is resistance (in Ohms)
Those two equations should get you through most basic circuits. Also, consult Kirchhoff's Loop Laws as needed. Hope this helps. Good luck!
2006-10-22 21:08:05 · answer #2 · answered by raven170806 2 · 0⤊ 0⤋