Final answer:
A UPS system is a combination battery charger and inverter, which converts stored DC power from the battery into AC power for use during a power outage.
Step-by-step explanation:
An uninterruptable power supply (UPS) system is a combination battery charger and inverter. The correct option is b. Inverter. The basic function of an inverter within a UPS is to convert stored direct current (DC) power from the battery into alternating current (AC) power, which is the type of power used by most electrical equipment in homes and businesses.
During a power outage, all electrical equipment stops working because there is an interruption between the power generator and your electrical devices. The UPS acts as a temporary backup power source that provides power continuity to the connected devices. This allows for safe shutdowns or ongoing operation until the main power supply is restored.
Understanding what a UPS does highlights the importance of the inverter in this system. A UPS does not generate electricity; it simply stores power and supplies it through an inverter when there is a power disruption in the electrical grid.