0
Yes, a plugged in transformer uses power with no load on it.
No transformer (or any electrical device, for that matter) is ideal, so there are always losses. There is parasitic capacitance, etc. that leads to power draw, particularly between the laminations. Plus, while the laminations are supposed to be insulated from each other, there is leakage current, and this causes power draw due to the tertiary transformer winding, that is partially shorted, which the laminations represent.
Another Answer
This simple answer is practically none.
The primary winding of a transformer draws a very small current (<5% of rated full-load primary current) when the secondary is open circuited (i.e. when the transformer is not supplying a load). Practically all of this 'no-load primary current' is responsible for the magnetic field set up within the core, and it lags the primary voltage by very nearly 90 electrical degrees, which means that the resulting power is practically entirely reactivepower (expressed in reactive volt amperes), and the amount of true power (expressed in watts) is negligible -for a small transformer, probably unmeasurable. For large power and/or distribution Transformers, of course, the amount of true power involved is indeed measurable, and contributes to the overall losses in an utility system.
It's 'true power' (not 'reactive power') which determines the rate at which energy is consumed. I suspect what you are really asking is how much ENERGY (true power multiplied by time) a small unloaded transformer uses, then the answer is negligible to the point of being unmeasurable. So it is safe to say that you can leave your transformer plugged in continuously without adding a measurable amount to your electricity bill.
Wiki User
∙ 9y ago
Wiki User
∙ 10y agoA transformer steps voltage up or down using two inductors next to each other. The ratio by which the voltage is stepped up or down is equal to the ratio of the loops per inch of the two inductors. Each inductor is part of a separate closed circuit; it is only their proximity that creates a current in the second circuit. So when the circuit containing the second inductor is opened (when the load is removed), the circuit with the first inductor is still a closed circuit.
Wiki User
∙ 13y agoThe transformer itsself is a load on the line side. Running it with nothing on the load side will not be a problem.
Wiki User
∙ 13y agowindings are still energized, nothing unusual should happen with no load
Wiki User
∙ 11y agowhen its primary winding is energized and secondary side is connected to a load,
Add your answer:
Earn +20 pts
How many houses can be run off of one electrical transformer drum?
Depends on the rating of the transformer and the running load of the houses connected to it.
How much current does a three phase 11kv 50kva transformer draw per phase no load and fully loaded and is there any significant loss in the average delta star transformer?
Fully loaded - 2.62 amps at 11kV. The no load depends on the transformer design, but it will usually be significantly less than the full load amps (not sure on this size, but on larger transformers it is typically ~.05 - .1% full load, so you'd be looking at ~2.5 mA RMS). The connection type is not important. Transformers are very efficient, thus there is not a whole lot of loss in the "average" transformer. The actual loss will depend on the design criteria of the transformer.
Where you can buy an auto transformer 0 120 240 volt?
Try at a electrical wholesale outlet. Don't know why you would want a auto transformer. A standard 240 to 120 transformer usually does the job and it can be run backwards or forwards. 240 primary 120 output on secondary or 120 primary 240 output on secondary. Either way you will have to know the amperage of the load to get the correct size of transformer.
What is the percentage load at which maximum efficiency occurs for the single phase transformer?
That is the maximum efficiency occurs when the copper losses are equal to the core losses of the transformer.
What is the efficiency of a transformer that has an input of 600 VA and an output to a load of 580 VA?
96%
Is a transformer load inductive or capacitive?
A transformer is fundamentally a set of coils; therefore, a transformer is an inductive load. However, by "transformer load", you seem to mean "the load that is connected to a transformer". Whether that load is inductive or capacitive depends mostly on what is hooked up to the transformer.
How many houses can be run off of one electrical transformer drum?
Depends on the rating of the transformer and the running load of the houses connected to it.
Difference between off load transformer and on load transformer?
Hope this helpsAn "OFF-Load tap transformer" can only have it's tap adjusted when it is De-energized,while the "On-Load tap transformer" can adjust its tap under load conditions.Kind RegardsHammad KhanUniversity of Western AustraliaAnswerAn 'off load' transformer is one whose secondary is open circuited, and not supplying a load. An 'on load' (not 'load') transformer is one that is connected to a load.
How do you load a transformer?
Anything that draws energy from a supply is a load. So you 'load' a transformer by attaching a lamp, a motor, etc., to the transformer's secondary windings.
Can i Over load an oil filled transformer?
Any transformer can be overloaded by applying a load above the capacity rating of the transformer.
Can a 5.8 ampere 110V run on a step up step down 300 W transformer?
No because the load is 638 VA which is too much for the transformer.
No-load and full load transformer?
A: a transformer will follow the rule of input output ratio with no load. As soon as a load is applied there will be changes in the ratio
Can you load a transformer by a pure capacitive load?
No
When is the efficiency maximum in a transformer?
the efficiency is maximum in a transformer when no load loss is equal to load loss.
Why does your power drain as soon as you put a load on it?
It could be a couple of things. Voltage drop is one, if the distance of the load is too far from the source of power this will happen. The other thing is if you are using a step down transformer and it is under sized, as soon as you apply the load the transformer output will drop off. If this condition lasts the transformer will eventual fail.
What is zero current transformer?
It is a transformer with No load attach to it.
Where does hysteresis in a transformer depend on?
The power lost by hysteresis depends on the peak flux density in the core. If the transformer is getting hot even when on no load, it should be run at a lower voltage.
