What is the main function of a transformer in an AC system?

What is the main function of a transformer in an AC system?

• A. Convert AC to DC
• B. Step up or step down voltage levels
• C. Regulate current flow
• D. Store energy

Answer: (B)

The main function of a transformer in an AC system is to step up or step down voltage levels. Transformers operate on the principle of electromagnetic induction and are designed to change the voltage of alternating current while maintaining the power level, meaning that the product of voltage and current remains relatively constant (aside from losses). When the transformer steps up the voltage, it decreases the current, allowing electricity to be transmitted more efficiently over long distances by minimizing resistive losses. Conversely, when stepping down the voltage, it increases the current to provide the appropriate voltage levels needed for end-use applications, ensuring that electrical devices receive the correct voltage for operation. The other options do not accurately describe the primary function of a transformer: converting AC to DC is performed by rectifiers, regulating current flow is managed by other devices such as circuit breakers or controllers, and storing energy is the function of capacitors or batteries rather than transformers.

The main function of a transformer in an AC system is to step up or step down voltage levels. Transformers operate on the principle of electromagnetic induction and are designed to change the voltage of alternating current while maintaining the power level, meaning that the product of voltage and current remains relatively constant (aside from losses).

When the transformer steps up the voltage, it decreases the current, allowing electricity to be transmitted more efficiently over long distances by minimizing resistive losses. Conversely, when stepping down the voltage, it increases the current to provide the appropriate voltage levels needed for end-use applications, ensuring that electrical devices receive the correct voltage for operation.

The other options do not accurately describe the primary function of a transformer: converting AC to DC is performed by rectifiers, regulating current flow is managed by other devices such as circuit breakers or controllers, and storing energy is the function of capacitors or batteries rather than transformers.