6th September 2018

quora

9

Can DC be applied to a transformer?

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Transformer is nothing but a pair of inductor coils which is wound on a magnetic core. If you apply DC to it, there wont be varying magnetic flux, so since there is no change in magnetic flux linking to the coil, emf is not induced on the secondary. So no DC output.

Also to know is, why DC voltage is not used in transformer?

Direct current(DC) has no time varying field because current is constant as well as there is no relatively motion between coil and core(magnetic circuit) of the transformer. So there is no induced emf in secondary coil of the transformer. Transformer fails to transfer power from primary to secondary.

Can you use a transformer to step up a DC voltage?

When a d.c voltage source is applied across the primary of the transformer,the current in the primary coil remains constant. Hence there is no change in the magnetic flux linked with the secondary. Therefore the voltage across the secondary coil is zero.Thus a transformer can't step up dc voltage.

1

What is the dc to dc converter?

A DC-to-DC converter is an electronic circuit or electromechanical device that converts a source of direct current (DC) from one voltage level to another. It is a type of electric power converter. Power levels range from very low (small batteries) to very high (high-voltage power transmission).

2

Can an efficient transformer step up energy?

Defend your answer. No, an efficient transformer cannot step up energy because that would violate the law of conservation of energy. A transformer has an input of 9 volts and an output of 36 volts.

3

What is a transformer and what is it used for?

A: A transformer is used to bring voltage up or down in an AC electrical circuit. A transformer can be used to convert AC power to DC power. There are transformers all over every house, they are inside the black plastic case which you plug into the wall to recharge your cell phone or other devices.

4

What is the use of pulse transformer?

Pulse transformer designers usually seek to minimize voltage droop, rise time, and pulse distortion. Droop is the decline of the output pulse voltage over the duration of one pulse. The magnetic flux in a typical A.C. transformer core alternates between positive and negative values.

5

Can a transformer operate on DC?

For a transformer to work, the current in one coil has to somehow make current flow in the other coil and the circuit it's connected to. A DC current in one coil will make a magnetic field on the other coil, but a magnetic field by itself won't drive any electrons around.

6

What is the transformer?

A transformer consists of two electrically isolated coils and operates on Faraday's principal of “mutual induction”, in which an EMF is induced in the transformers secondary coil by the magnetic flux generated by the voltages and currents flowing in the primary coil winding.

7

What is the use of isolation transformer?

An isolation transformer is a transformer used to transfer electrical power from a source of alternating current (AC) power to some equipment or device while isolating the powered device from the power source, usually for safety reasons.

8

How does a capacitor behave at high frequencies?

This means that at very high frequencies the capacitor acts as an short circuit, and at low frequencies it acts as an open circuit. When you say low or high, you talk relative to something. Capacitor works on electrostatic induction. When a DC voltage is applied across it, the electrons reaches one side of the plates.

9

Why the rating of transformer is in KVA?

Copper losses ( I²R)depends on Current which passing through transformer winding while Iron Losses or Core Losses or Insulation Losses depends on Voltage. So the Cu Losses depend on the rating current of the load so the load type will determine the powerfactor P.F ,Thats why the rating of Transformer in kVA,Not in kW.

10

What type of transformer has more turns in the primary than the secondary?

A step down transformer has less turns on the secondary coil that the primary coil. The induced voltage across the secondary coil is less the applied voltage across the primary coil or in other words the voltage is “stepped-down”. Transformers are very efficient.

11

Why is electricity transmitted at high voltage and low current?

Transmitting electricity at high voltage reduces the fraction of energy lost to resistance, which varies depending on the specific conductors, the current flowing, and the length of the transmission line. For a given amount of power, a higher voltage reduces the current and thus the resistive losses in the conductor.

12

What rotates in a brushless alternator?

Smaller brushless alternators may look like one unit but the two parts are readily identifiable on the large versions. The larger of the two sections is the main alternator and the smaller one is the exciter. The exciter has stationary field coils and a rotating armature (power coils).

13

Is Transformers Marvel or DC?

The Transformers was an 80-issue American comic book series published by Marvel Comics telling the story of the Transformers. Originally scheduled as a four issue mini-series, it spawned a mythology that would inform other versions of the saga.

14

What is a step down transformer?

A transformer that increases voltage from primary to secondary (more secondary winding turns than primary winding turns) is called a step-up transformer. Conversely, a transformer designed to do just the opposite is called a step-down transformer.

15

Why DC voltage is not used in transformer?

Direct current(DC) has no time varying field because current is constant as well as there is no relatively motion between coil and core(magnetic circuit) of the transformer. So there is no induced emf in secondary coil of the transformer. Transformer fails to transfer power from primary to secondary.

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