What component changes 120 V AC power to a lower AC voltage for other uses?

What component changes 120 V AC power to a lower AC voltage for other uses?

• A. Resistor
• B. Transformer
• C. Capacitor
• D. Inductor

Answer: (B)

A transformer is the correct component for changing 120 V AC power to a lower AC voltage. It operates on the principle of electromagnetic induction, consisting of two coils of wire (primary and secondary), which are wound around a common core. When AC voltage is applied to the primary coil, it generates a magnetic field that induces a voltage in the secondary coil. The ratio of the number of turns of wire in the primary coil to the number in the secondary coil determines whether the output voltage is stepped up or stepped down. In this context, to reduce the voltage from 120 V AC to a lower level, the transformer would be configured with more turns on the primary coil than on the secondary coil, effectively lowering the voltage output while maintaining the same frequency. This makes transformers essential for a variety of applications such as power distribution, where different devices require different voltage levels to operate efficiently and safely.

A transformer is the correct component for changing 120 V AC power to a lower AC voltage. It operates on the principle of electromagnetic induction, consisting of two coils of wire (primary and secondary), which are wound around a common core. When AC voltage is applied to the primary coil, it generates a magnetic field that induces a voltage in the secondary coil. The ratio of the number of turns of wire in the primary coil to the number in the secondary coil determines whether the output voltage is stepped up or stepped down.

In this context, to reduce the voltage from 120 V AC to a lower level, the transformer would be configured with more turns on the primary coil than on the secondary coil, effectively lowering the voltage output while maintaining the same frequency. This makes transformers essential for a variety of applications such as power distribution, where different devices require different voltage levels to operate efficiently and safely.