Physics · Magnetism and Electromagnetic Induction

A transformer is an electrical device that uses the principle of electromagnetic induction to transfer electrical energy between two or more circuits. Its primary function is to change the voltage of an alternating current (AC). It cannot convert AC to DC or vice versa, as those functions require additional devices like rectifiers and inverters. Transformers can either step up or step down voltage levels but do not inherently change the total power (measured in watts) because power is conserved (ignoring minor losses due to efficiency).

Option A is incorrect because converting AC to DC is the function of a rectifier, not a transformer. Option B is incorrect as inverting DC to AC is the role of an inverter. Options D and E are incorrect because transformers do not inherently increase or decrease the total power supply.

Option A is incorrect. A transformer cannot convert AC to DC; that task is performed by a rectifier.

Option B is incorrect. This function is performed by an inverter, not a transformer.

Option C is correct. A transformer is specifically designed to change the voltage of an alternating current (AC) using electromagnetic induction.

Option D is incorrect. While a transformer can change voltage and current levels, it does not inherently decrease the power supply.

Option E is incorrect. A transformer can adjust voltage but does not increase the total power, as power is a product of both voltage and current.