Transformer Current Drops with Load


by Physicist3
Tags: current, drops, load, transformer
Physicist3
Physicist3 is offline
#1
Feb4-14, 05:34 AM
P: 72
Hi,

I have observed that as the load applied to a transformer secondary is increased (i.e. Increased Impedance), the current drawn by the transformer seems to decrease. Is this purely due to the fact that because the voltage remains fairly constant and the impedance is increased, the current must be reduced to allow ohms law to be maintained??

Thanks
Phys.Org News Partner Engineering news on Phys.org
Researchers propose network-based evaluation tool to assess relief operations feasibility
Large streams of data warn cars, banks and oil drillers
Engineering student developing traffic forecasts
Baluncore
Baluncore is offline
#2
Feb4-14, 05:44 AM
P: 1,270
Power in the primary will be the same as power in the secondary. Wp = Ws
Therefore Vp * Ip = Vs * Is
Increasing the load impedance will reduce the secondary current according to Ohms Law.
That in turn will reduce the primary current.

“Increase the load”? Or “increase the load impedance” which would reduce the load?
sophiecentaur
sophiecentaur is offline
#3
Feb4-14, 03:39 PM
Sci Advisor
PF Gold
sophiecentaur's Avatar
P: 11,352
A language problem here: The term "Increasing the load" involves increasing the Current, which implies Decreasing the Resistance (Impedance) of the Load.


Register to reply

Related Discussions
Inrush in Transformer at no load Electrical Engineering 1
Low load factor and Voltage drops Electrical Engineering 5
Transformer load Electrical Engineering 3
How transformer loss vary with load current? Electrical Engineering 2
load through a transformer Electrical Engineering 2