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Which of the following statement regarding transformer is incorrect?
1) A transformer makes use of Faradays Law.
2) The ferromagnetic properties of an iron core is used by it to efficiently raise or lower AC voltage
3) It cannot increase power so that if the voltage is raised, the current is proportionally lowered and vice versa.
4) The current induced in primary circuit is of same nature as in secondary circuit with differences in amplitude only.
The correct answer is It cannot increase power so that if the voltage is raised, the current is proportionally lowered and vice versa.
The statement that is incorrect regarding transformers is (C) “It cannot increase power so that if the voltage is raised, the current is proportionally lowered and vice versa.”
Transformers are electrical devices that are used to transfer electrical energy from one circuit to another circuit through the principle of electromagnetic induction, which is based on Faraday’s law. They are primarily used to either increase or decrease the voltage of an alternating current (AC) power supply.
Transformers consist of two coils of wire wrapped around a ferromagnetic core, which is usually made of iron. The alternating current flowing through the primary coil generates a magnetic field, which in turn induces an alternating current in the secondary coil. The voltage induced in the secondary coil is proportional to the ratio of the number of turns in the secondary coil to the number of turns in the primary coil.
Option (A) is correct because transformers make use of Faraday’s law of electromagnetic induction to transfer electrical energy from one circuit to another.
Option (B) is also correct because the ferromagnetic properties of the iron core are used to efficiently raise or lower the AC voltage. The iron core increases the magnetic flux and reduces the magnetic reluctance of the transformer, which results in a more efficient transfer of energy.
Option (D) is also correct because the current induced in the primary circuit is of the same nature as in the secondary circuit, with differences in amplitude only.
Option (C) is incorrect because transformers can either increase or decrease the voltage of an AC power supply while conserving the power. This means that if the voltage is raised, the current is proportionally lowered, and vice versa. Therefore, transformers can increase or decrease the voltage without changing the power.
In summary, the incorrect statement regarding transformers is (C) “It cannot increase power so that if the voltage is raised, the current is proportionally lowered and vice versa.”