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Is transformers are devices that change voltage by means of magnetism True or false?
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Why transformers are not excited with dc?
by using step-up transformer we can change the voltage in higher level
What can be said about the current if more devices are added in series and battery voltage does not change?
By devices, assume you mean resistances. When you add more R to a series ckt, I decreases.
Do step up-down transformers waste electricity when plugged-in but not in use - note this is not referring to AC-DC converters but transformers that change voltage between 110-120v to 220-240v?
yes -- the input current still runs in the primary coil.
Can a Dy11 vector group transformer be connected to a Yd1 vector group transformer source?
In series, yes. In parallel, nope! Putting a Yd1 transformer in series with a Dy11 transformer would result in the output of the Dy11 transformer being identical to the input of the Yd1 transformer with the exception of the voltage magnitude - this will change depending on the winding ratio's on both transformers. But, in regards to other properties of the voltage, the phases will in be in phase, with the voltage in-between the two transformers lagging by 30 degrees.
Why is voltage regulation important in transformer?
the transformers are used to step down the supply voltage:) power supply kit is mostly used for electronic equipment... electronic equipment operate in low volatge, for that purpose we using transformers in the power supply:) with regards sakthivel lect/EEE
What devices use transformers?
Transformers are used to change the voltage in a circuit from high to low or from low to high. Some of the gadgets that use transformers include surround sound systems, the CPU power supply and speakers which have inbuilt amplifiers.
Why doesn't a transformer convert AC into DC?
transformers increase or decrease voltage. converters have rectifiers inside, which change ac to dc Transformers are devices that operate on the change in magnetic field, That change in magnetic field only induces an AC voltage/current into the secondary winding. From there it must be rectified to obtain DC, and is very often filtered to make it usable.
Certain electric devices such as cordless telephones have small transformers that plug into walls.what do the transformers do?
Transformers are relatively simple devices which change both the current and the voltage of an electric source without affecting the total amount of power being given. Power, as the product of current and voltage, is mostly conserved as transformers are used, but the current and voltage changes. If the device needs just half the voltage of what is coming out of your wall (240v in Australia), then it will 'step down' this voltage by half, but will have to 'step up' the current, so your voltage will halve, your current will double, but the total amount of power will remain the same. Essentially the transformer exists to give your device the required input of electricity so your device is not fried!
Why transformers are not excited with dc?
by using step-up transformer we can change the voltage in higher level
What components are used to change an AC voltage to a lower or higher value?
Step up transformers are used to increase the voltage to a higher value
How can a change in voltage of a transformers primary coil create a change in the secondary coils voltage without the coils touching?
The more coils you have on one side will increase the magnetic force
What is distribution transformer?
Distribution transformers change the feeder voltage to utilization voltage required by the consumer. they are essentially step down transformer which changes the voltage to standard service voltage. their rating is about 200KVA. since these transformers are operated throughout a day, eventhough they r not carrying load r not, it should hav a good ALL DAY EFFICIENCY .
How does voltage change across an appliance in a parallel circuit?
With the minor voltage loss in the wiring, the voltage drop across a single appliance is the total voltage in the circuit, and doesn't change when more devices are added in parallel.
Does a transformer convert electrical energy into kinetic energy?
A transformer moves energy from one circuit to another. What form that energy takes is dependent on the apparatus being supplied with the energy. If going to a light, the energy is thermal and radiant. If going to a fan it is kinetic.
What objects use electromagnets?
speakers, induction stoves, transformers to change the voltage, magnetic conveyer belts, and much more.
Why ac current is used in a transformer?
AC current or DC current can be used in transformers. A transformer is made of two coils of wire, the input coil induces a current into the output coil. Transformers change the voltage either up (step up transformer) or down (step down transformer). The amount of change in voltage is dependent solely on the number of windings in both coils in the transformer. DC transformers work exactly the same way AC transformers do.
What is the purpose of constant voltage transformer?
The term 'constant voltage transformer' is used to differentiate the operation of transformers that are intended to change voltage levels, from those intended to change current levels -a current transformer (CT), for example, is termed a 'constant current transformer'.
