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. A step-up transformer has a primary coil with 100 turns and a secondary coil with 25 turns. If the input voltage in the primary coil is 40 volts what is the output voltage reduced to in the secondar?
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How a transformer transfer electricity?
A transformer works because of two principles:(a) magentic fields are created by the movement of charged particles - this includes electicity (electrons) moving through a regular cable.(b) a conductor will induce a charge if it is moved through a magnetic field.In a transformer the primary coil is powered which results in a magnetic field being produced, as per (a). Because the magnetic field generated by a single cable is very small a transformer uses a coil of several hundred loops to increase the magnetic field produced.A transformer needs to be powered by AC (alternating current). In AC the direction of the current flow changes (e.g. mains power typically changes direction 50 to 60 times per second). As the AC power changes polarity so does the magnetic field and the North-South poles swap with the AC power.This changing of magnetic poles is equivalent to moving the magnetic field around. Even though the secondary coil doesn't move, because the magnetic field is moving a current is induced in the secondary coil as per (b).The number of loops in the primary coil compared to the number of coils in the secondary loop is used to control the strength of the magnetic field, the secondary coil induction effect and thus the output voltage. This is a simple ratio, so if the secondary coil has twice as many loops as the primary then the output voltage will be twice the input voltage.There are two types of transformers, "step up" where the voltage is increased and "step down" where the voltage is reduced.
What is a Step Down Transformer do?
High alternating voltage will be reduced to low alternating one. Such step down transformers are used in power adaptors for electronic devices such as video games etc
What happens to the kinetic energy of a body if its speed is reduced to half?
If the speed of a moving body is reduced to half, its kinetic eneergy is reduced to 1/4 .
What is friction reduction?
It means what how can the friction be reduced. To answer this question, Friction can be reduced by devices like ball bearings, wheels and lubricants.
If the height of a cylindrical barrel is reduced from 12 feet to for feet what happens to the vlume of the barrel?
The volume is reduced to 1/3 of its size.
What changes a low voltage into a higher voltage?
The step up transformer is used to change the voltage from high to low or low to high voltage by eitherincreasing the number of inding or reducing the number of winding in the transformer,thus when the winding reduced on side of primary winding and ingreasing number of winding on secondary side it means the transformer should be step up transfo0rmer,and when the you increase number of turnsin primary side and reduce turned on secondary sidde the transformer said to be step down transformer
The purpose of transformer percentage impedance?
Inherently, the actual impedance seen at the secondary voltage will be different than that seen at the primary voltage. To make things easy, we use symmetrical components, where transformers are reduced to a p.u. (per unit) impedance. 100 x p.u. is equivalent to the percentage impedance you are referring to. When converted to per unit, a transformer has one impedance, not two, so it does not matter whether you are looking through the transformer from the secondary or the primary.
If one transformer of a delta transformer bank fails the bank can be reconnected open delta and operate at reduced efficiency?
yes open all fuses close the primary neutral tap,remove secondary leads off of bad traansformer,tell customer to reduce his load until bad transformer can be replced.
How do 480 volt control circuits work?
Some control circuits remain at line voltage but most use a reduced voltage of 120 volts. This is acquired by the use of a control transformer 480 primary to 120 volts secondary.
What is the difference between Auto transformer and Power transformer?
An auto transformer has one winding with the output being tapped at some point and therefore has no isolation between primary and secondary. This may make it unsafe or illegal in some applications. A common power transformer has separate windings.
What is the rated current when a step down transformer is 50kVA and 120v in step down to 24v?
The VA of the transformer is the product of the amps x the volts. V x A = Watts. 50kVa is equal to 50,000 watts. It holds true on the primary and the secondary. The formula to use is I = W/E. Amperage = Watts (V x A)/volts.AnswerThe above answer will determine the rated currents of the primary/secondary windings. But the actual currents (which shouldn't exceed their rated values for any length of time) are determined by the load. For example, with no load, no secondary current will be flowing, and the primary current will be reduced to its magnetising current value.
What is the colour of K2Cr2O7 when oxidized or reduced?
Orange ---> Green Primary and secondary alcohols, no reaction with tertiary
In a transformer primary or secondary will inside winding?
A step-down transformer's primary is high voltage and secondary is low voltage, based on voltage configuration or load we select which winding we do fast.In air-cooled Transformers output voltage is high and load current is low. So in air cooled low voltage winding in side and high voltage winding in out side of the coil . So we can reduce high voltage short problems and we can easily provide coil insulation . reduce short problem. It is cooled in oil.In step-down transformers we can do high voltage inside of the coil and low voltage and high current of the coil is outside. Because we can better coled in outer side . and reduced to temp problems.AnswerThe terms 'primary' and 'secondary' do not relate to a transformer's voltages, but to how its windings are connected. The primary winding is connected to the supply and the secondary winding is connected to the load. So, for a step-up transformer, the secondary winding is the higher-voltage winding while, for a step-down transformer, the secondary winding is the lower-voltage winding. Your question, therefore, should ask whether the higher- or the lower-voltage winding is the 'inside' winding (i.e. the winding closest to the core), and the answer is that it is the lower-voltage windings are innermost and the higher-voltage windings that are outermost.
What multimeter readings set to measure resistance indicate an open circuit and short circuit in the primary and secondary windings of a mains power transformer. And what readings show good?
You cannot use an ordinary multimeter to assess the difference between a normal power transformer winding and a shorted power transformer winding. You need a Q meter and/or to power it up at a reduced voltage with limited current to see what happens. Note that a shorted power transformer is capable of exploding, so you need to take appropriate safety precautions.
How does it work the transformer and generator?
A transformer use a varying voltage on one coil to impress a voltage on another coil by induction. Transformers cannot pass DC as a direct current does not have a varying voltage level. A power transformer connected to a wall outlet receives 120Volts AC (alternating current) at 60 Hertz (cycles per second) into it's primary coil. If it's a step down transformer with a 10-1 turns ratio a 12 VAC voltage will appear at the terminals of the secondary winding on the transformer. The windings (coils) are wound around an iron core to provide a circuit for the magnetic field and improve transformer efficiency. There are many different types of transformers in use, the type is dictated by the application the transformer is being used in. The theory of operation of Transformer
How does a current transformer work?
A current transformer is used in high voltage circuits where it is not possible to measure current directly. A CT is a step up transformer with only one turn in primary. There will be as many cores based on the purposes like metering, protection etc. The secondary of a CT should never be kept open circuited bcoz very high flux will be developed in the secondary and hence it may be damaged.
How can photochemical smog be controlled?
if we control the primary precursors of photo chemical smog,such as NO2 and hydrocarbons,the secondary precursors such as ozone and PAN,the photo chemical smog will automatically be reduced.
