A transformer -a)converts DC to ACb)is used to decrease or increase AC voltagec)converts AC voltage to DC voltaged)converts electrical energy into mechanical energyCorrect answer is option 'B'. Can you explain this answer?

Question

Answer

Explanation:

A transformer is an electrical device that is used to transfer electrical energy from one circuit to another circuit without a change in frequency, but with a change in voltage level. It works on the principle of electromagnetic induction. In a transformer, there are two coils, one is the primary coil, and the other is the secondary coil. These coils are wrapped around a common core. When AC voltage is applied to the primary coil, it induces a changing magnetic field, which in turn induces a voltage in the secondary coil.

Uses of Transformer:

Transformers are used in various applications, such as:

To increase or decrease the voltage level of AC power from one level to another level, such as in power transmission and distribution systems.

To isolate two circuits electrically, such as in audio equipment, medical equipment, and power supplies.

To match impedance between two circuits, such as in audio equipment and communication systems.

Working of Transformer:

The working of a transformer can be explained as follows:

The primary coil is connected to an AC voltage source, which generates an alternating magnetic field in the core.

The alternating magnetic field induces a voltage in the secondary coil, which is proportional to the number of turns in the secondary coil.

The voltage in the secondary coil can be increased or decreased by changing the number of turns in the secondary coil.

The transformer operates on the principle of conservation of energy, i.e., the input power is equal to the output power.

Conclusion:

Hence, we can conclude that a transformer is used to decrease or increase AC voltage, and it does not convert DC to AC or AC voltage to DC voltage, nor does it convert electrical energy into mechanical energy.

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