Question

A transformer *
1 point
Changes AC to DC
Changes DC toDC
Step up or down DC voltage
Step up or down AC voltage​

Answer 1

Answer:

ANSWER

Transformers are found everywhere alternating current is used. This includes both large power stations to the power cord for our laptop computer. A transformer is an electrical device that trades voltage for current in a circuit, while not affecting the total electrical power. This means it takes high-voltage electricity with a small current and changes it into low-voltage electricity with a large current, or vice-versa. That is, step up or step down the voltage in a circuit.

A step-up transformer turns low-voltage electricity into high-voltage electricity while dropping the current. A step-down transformer changes high-voltage electricity into low-voltage electricity.

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. A changing magnetic field, however, does create an electric force which will accelerate those electrons in the other coil into carrying a current. This process is described by Faraday's law of induction. We get a changing field from an AC current, since the current which makes the field is changing. Hence, DC current cannot be used as a source for a generator.

Explanation:

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Answer 2

Transformer is a device that changes alternating current AC and voltage in a electric circuit. It is used to pass alternating current from one circuit to another. It does not work on direct current DC or direct voltage.

It changes the value of Alternating current ,not AC to DC or DC to AC. Similarly it increases or decreases the AC voltage.

$p = vi$

Output and input power (P) remains the same as both voltage (V) and current (i) changes

There are two types of transformers depending on the above criteria.

Step up transformer

Stepdown transformer

In step up transformer output voltage is greater than input voltage and the current decreases. ie they are used to produce high voltages .This they are not suitable for home and are generally used at power stations

In step down transformer the output voltage is less than input voltage and the current increase. ie they are used to produce high currents and low voltages.

The principles of mutual induction and electromagnetic induction (Faraday's law) are used in transformer.

Further links-

https://brainly.in/question/8411484

https://brainly.in/question/47035

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