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The correct response identifies two essential aspects of power supply wattage that are crucial for understanding how power is measured and applied in electronic devices.

The first statement is that a 'watt' describes how much work or how much power can be supplied to various devices. This is true because a watt is indeed a unit of power in the International System of Units (SI). It quantifies the rate of energy transfer and is defined as one joule per second. This fundamental definition helps in understanding how power supplies function and the expectations for their performance.

The second part mentions that the wattage requirement for each individual circuit uses the formula W = V x A, where W represents watts, V represents volts, and A represents amperes. This formula is integral to electrical engineering, allowing the calculation of power based on voltage and current. By using this equation, technicians can determine if a power supply can meet the requirements of individual components within a system, ensuring that they operate effectively without exceeding their power limits.

Together, these statements provide a comprehensive understanding of how wattage relates to power supplies and the necessary calculations for determining power needs in electrical circuits.