ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals

Topic Options
Rate This Topic
#129103 - 07/26/04 04:05 PM series circuit's
james S Offline
Member
Registered: 05/13/03
Posts: 107
Loc: West England
In a series circuit which is supplied by constant current regulator at 50 HZ(keeps current at 6.6 amps no matter what load is introduced or taken away with respect to the size of regulator),and consists of many 1:1 transformers with there primary winding connected in series with the circuit loop, the secondary having a lamp with the necessary current rating (matching the series circuit current rating)and the same wattage rating as the transformer it is connected to.

my question this,

if i was to insert a lower wattage lamp (50W) on the secondary side of a 100W transformer, would there be 100W being produced by the lamp?

The way i understand it is the lamp takes the necessary VOLTAGE in this case, and the constant current, which then produces the rated wattage of the lamp.

If my understanding is correct, would this leave the overall series circuit a little more inductive due to the full rating of the secondary not being used resulting in a inductive reactance on the primary.?


sorry to go on!!!!!!
Top
Tools for Electricians:
#129104 - 07/30/04 03:57 PM Re: series circuit's
Trumpy Offline


Member
Registered: 07/05/02
Posts: 8211
Loc: SI,New Zealand
James,
Please bear in mind that a 50W lamp will never dissipate 100W of energy, not matter what it is connected to.
The current drawn by a given size of lamp, is based on the resistance of the lamp filament, the higher the lamp resistance, the lower the current drain on the supply.
Also, with regard to transformers, you can never draw the full nameplate wattage (VxI) from a transformer, because they have a certain "loss factor", caused by Iron losses, Copper losses and Hysteresis losses.
_________________________
Let's face it, these days if you're not young, you're old - Red Green grin
Top

Member Spotlight
Member Since: 12/24/00
Posts: 4259
New in the Gallery:
SE cable question
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box


Who's Online
0 registered (), 64 Guests and 8 Spiders online.
Key: Admin, Global Mod, Mod
 
New in the Gallery:
SE cable question
 
Top Posters (30 Days)
Admin 49
HotLine1 43
gfretwell 18
Ruben Rocha 12
Trumpy 9
 
Newest Members
Freecrowder, clee512, Jdscott2005, FAIZAN, Regitest2

ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals